I'm not sure what there is to update about a classic. As a matter of fact one probably shouldn't try to change a classic at all.
The 'core concept' of Star Trek is what makes it a classic. As long as they get that right, we'll be fine.
The problem is that the definition of the core concept is going to be a little different for each fan.
This is one of the first steps towards Star Trek's possible immortality. If the old can successfully transcend into the new, then a chain begins, leading back to the original on one end, and on into an infinite future on the other.
I'm a huge Superman fan, and that's a concept that is reinvented time and time again, often successfully. As each new variation arrives, we are free to accept or reject them as either: a) true to the core concept of Superman, b) quality entertainment in their own right, or c) both.
If Star Trek XI succeeds on any level, there is the very real possibility that this is just the first of many interpretations of Star Trek. Some we will love. Some, not so much.
But if this one fails, there is that much less of a chance that it will be reinterpreted again in the future. Which is what some fans want.
I would prefer Star Trek XI to succeed, even if it turns out I that don't like it. I loved the original version. Maybe I'll love the new version. Maybe I'll have to wait for the next version after that. If Star Trek XI crashes and burns, there might not be a version after that.
But if the franchise remains healthy, the original series will always remain a relevant and available link in the historical chain. If not, the original series will eventually fade into obscurity. It might still have the ability to hold an audience, but no one will ever see it, because it will become something one has to go too far out of her way to find.
A successful Star Trek XI is a win for almost everyone.