Not at all actually. It's not as if they need MBK to keep T-ara or their own careers alive. For now they're still signed up with some work under MBK, Jiyeon's solo comeback, and Eunjung and Hyomin's dramas for example. After that, they'll sign with another agency(ies) that better suit their needs, be it individually or together. To focus on individual career does not have to be of any affect on the group. Unless they want it that way, in which case I don't see why T-ara would unnecessarily sell false hope to fans about it. I mean, why should we conclude they are disbanding when T-ara themselves say they're not? If they really wanted to move on, they'd just plain say it, nothing to gain from beating around the bush, ya know? (Check out their interviews during Tiamo promos, they often brought up sincere desires to keep the group going.) Granted, it understandably may take a little time to regroup after December as they sort out agencies, legal matters of the group, etc.