@Uncle_fan - I strongly beg to differ there.
It's called being realistic.
Idol groups don't last forever, and this is an obvious fact that's been proven by history itself. There have been groups in the past in Korea whose fandoms were numerous times bigger and supportive than T-ara's and even SNSD's to a degree, but they disbanded and went their own ways. Some simply became a shadow of their former glory (i.e. Shinhwa, G.O.D and likely Buzz).
1) If CCM actually learnt how to do proper PR, then the media wouldn't have been going on a reporting spree and the catastrophe could actually have been better contained and had a smaller impact on T-ara's image. Blaming it all on the media is just plain ignorance and only breaking the tip of the iceberg.
2) Who's 'they'? You make it sound like the group endured it all out of their own sheer willpower without taking in the factor of management. In case you've forgotten or simply never knew, regardless if they wanted to give up or not, they were in absolutely no position to do anything out of their own choice. Kim Kwangsoo as early as 2011 had made it fairly clear that idols should never ever go up against their company regardless of reason, and is not afraid of making it extremely difficult for those who do so in a rather appalling manner - Nam Gyuri and Hwayoung are two major example.
Bluntly put, CCM has a gun put up right behind their heads 24/7. Seriously, there are way too many fans who literally either deny, fail to acknowledge or remain ignorant of this, while putting all the blame on the media and Korea's online community. It's rather distasteful whitewashing, at best and at worst, makes them no better than the other side, if not even more so by making everything so black-and-white.
T-ara doesn't have full power over what they want to decide in regards to their careers whether as a group or individual, as with many other idols.
3) Lee Hyori didn't grow bigger because she didn't 'give up'. She was already fairly well-known as early as her days in FinK.L. though today, is nowhere near as popular as she was back in her primal years. Just like many other older celebrities.
4) You're basically saying fans should be mindless drones that should accept and support everything the group does. If that's what you think fans should do, then it's no different to saying we should support CCM.
5) A fan is someone who stays with their celebrity because they simply like said celebrity in whatever way he/she interprets it to be. The definition of fan, is very debatable. As far as T-ara is concerned, there are fans who like them for their looks, fans who like them for their personalities, fans who like them for their music etc. It's all split, and the word 'fan' is what keeps them together in one spot as a community. Not a group that basically says 'T-ARA STRONG!!!!!!' all the time.
6) CCM obviously never really considered fans to be of much importance anyway. Back in 2012, there was quite a bit of worries/concerns that T-ara was being severely overworked, in poor health (in Boram's case, specifically) and the whole new member debate + KKS's public threats against the group. These concerns, were either flat-out ignored or met with a rather lackluster response, which pretty much says the company doesn't give a damn about our opinions so long as they can make a quick buck out of our wallets even if it means having to overwork the group to extremely unhealthy lengths (which they already have plenty of times).
If their agency can't even respect fans even if its valid concerns, then that makes supporting the group a little bit difficult, at least for me anyway.
7) Whether you like it or not, the Hallyu Wave cannot sustain on being more reliant on K-pop. It doesn't help that the music industry in Korea is utterly corrupted to the core along with the filming industry, yet the K-government is trying to export it as some kind of brand of perfect lala-land lollipop.
Secondly, contrary to what you claim, K-pop has been largely the same for the last several years. Ever since 2010 (if not 2009, arguably), the music industry's been badly over-saturated with cookie cutter idol groups that are basically knock-off versions of the more successful groups and has become extremely reliant on idol groups for revenue, and this shows absolutely no sign of slowing down anytime soon.
If anything, at its current rate, K-pop has already shot itself in the foot in the long-term. There are no potential successors of the mega- groups like SNSD, 2NE1, Big Bang, DBSK etc. and the 'mid-tier' groups like After-School, SECRET, SISTAR etc. either don't have large enough fandoms, labels with abundant resources or staying power to replace them once they disband.