The examples of Jurassic World and Star Wars: The Force Awakens clearly show that a genre film that stays true to its roots can be a record-breaking commercial success. The danger is that if the new Trek film moves to abandon its own, it will further diminish its own fanbase.
You can't compare
Star Trek to either of those franchises, though - it's an entirely different beast. And in fact the new movies already are trying desperately to make
Star Trek more like those franchises: broad and accessible rather than niche and aloof.
Jurassic Park and
Star Wars were both amazing commercial successes and cultural phenomenons. I guess
Star Trek fans would also argue it was a cultural phenomenon, but it would be hard to argue it was anywhere near on the same scale as either of these properties. When
Jurassic World and
The Force Awakens 'stayed true' to their roots, they resulted in record-breaking box office receipts, but only because those roots run deep
and wide. When
Star Trek stays true to its roots, you get
Nemesis, or
First Contact, or
Generations, or one of however many other
Star Trek films that have done little business at the box office. Look them up here:
All Time Worldwide Box Office Grosses. It's no coincidence that you'll find
Jurassic World and
Jurassic Park both in the top twenty, and soon you'll find
The Force Awakens along with four of the other six other
Star Wars movies in the top one hundred. The only
Trek films I spotted in the top 625 listed are, unsurprisingly, the reboots - and not until page two or three.
The
Star Trek fanbase that you're wishing the new movies played to is too small to justify indulging them in that way - past history has shown that's not a commercially viable approach. If it comes down to appealing to the die-hard fan dollar, or the popular dollar, especially in today's film industry, then the latter will win every time.