Bogging down a movie with "canon" and TV show background isn't going to help. It could be said the TNG-through-to-Nemesis "universe" was being dragged down by its own canon and history. Hence, reboot with the new movie and bang, success.
Yes, Khan had a show origin "backstory," but that was explained and done with with a short little "speech" by Khan. It didn't drag the movie down.
Trying to tie in and bring in so many elements from the series is just going to appeal to hard-core fans, who aren't a big enough audience to make a movie successful.
First Contact didn't seem to have much of an issue, and that was TNG's most popular movie. You can quickly bring the general audience up to speed, but you don't want to ignore your core audience either. That's actually something I feel cynical regarding Abrams trek. It just doesn't feel like this current state of Trek is for me, yet I would love to see Star Trek return in some form and what Abrams is doing is the best we have.