The big difference I see between Trekkies and most nuTrek fans is that when Star Trek ceases to be trendy and "in", Trekkies will still be fans. Most nuTrek fans will have moved on to the next big thing.
Thats really not that different from people who watched any one (or more) of the series when they aired (or films when released) and never watched them since.
It's just on a big screen with more hype.
Some will join the fad, some will become full on fans, some already are and a few are batshit crazy. Nothing changes