If you consider the XX, XX3, and the 2010, I'd say Tinker is still working his magic. Notice the trend in J's? If Tinker doesn't have a hand in it, it really isn't that great. XIX, XX1, XX2, 2009... JB tries to go with their newer designers, but they always go back to Tinker because he always has an amazing design.
Think about it, The XX, The XX3, and the 2010 not keeping up with the legacy? I'd say the XX1, XX2, and 2009 didn't even come close to these in terms of the legacy. All of those NOT designed by Tinker. So yeah, if you think Tinker doesn't care anymore then hell, I'd rather take his half-!@+ed care that still produces nice designs then some other guy's 10000% care that is whack as hell.
I feel like the "legacy" isn't there because we aren't seeing MJ wear them on the court. That's what makes the 1-14 so special. But hey, at the end of the day, to each his own.