I believe that when one upgrades MMA, the shopping cart specifies that the license is upgraded to 11.0--not 11.0.0. If an 11.0.2 or .0.3 or .0.4 gets released, you should automatically see its availability to upgrade/download for free in your User Portal.
I specifically noticed the "11.0" license upgrade when I just bought mine recently. Correct me, someone, if you know I'm wrong here, but... To me, that implies that I will have to pay for an upgrade to 11.1's features, but not for bug fixes to 11.0.X.
So, yes. Don't bother to wait for bug fixes if you think you want 11.0 features. It hasn't given me any trouble yet, and I've got a pretty weak Windows 10 x64 laptop.
(Thanks for the info about the upcoming price increase. I'm glad I did mine before that.)
