There's no restoring to be done. The attack on the U.S.S. Kelvin created a new timeline that exists alongside the original.
In practical terms - for TV and movies - the new timeline exists from here on out; the original timeline exists from 1964 to 2005.
Maybe, but this is the TrekLit forum, where we get to have both timelines.
(And that's assuming that no one who makes future Trek productions decides to go back to the Prime Timeline. And Trek being Trek, it's probably best not to rule anything