If Ainge wanted a good (not great) center, don't you think he would have acquired him by now? I mean, players like Gortat, Okafor, Jordan, Hawes, Blatche, etc have been floating around for a while and it doesn't seem like we would have had to give up the farm for any of them.
Asik is a nice player and probably better than those I listed, but makes a somewhat hefty salary and isn't really in the attainable upper-tier (Cousins, Monroe, Aldridge, etc). I guess if we could get him for Bass and Lee, we go for it; otherwise, I am okay with waiting until we get our definite center for the next 10 years.