Here's a GREAT way for the film-makers not to feel beholden to forty years of background: come up with their own characters and their own distinctive fictional universe. Or at the very least use the Trek mythology/universe but create new characters to explore.
They tried that with Voyager and Enterprise, but people stopped watching. The reality was that this film had to make money, and it was adjudged that the best way of doing so was to start again, using the familiar TOS characters. If the film had flopped, you could kiss goodbye to any more Star Trek for a generation. Fortunately it looks like a hit, and they are talking about a sequel already.
I'm sorry to make this sound so brutally dispassionate, because we all love the forty years of history behind Star Trek, but it's only going to be made if Paramount can make money out of it. That's why Star Trek was cancelled in 1969, why Enterprise was cancelled, and why Nemesis was the last of the TNG films. It's as simple as that. Money does make the world go round. If Paramount think this is the best way of making money out of Star Trek, you can be pretty certain they are right. Creative concerns are secondary.