assuming that Spock Prime mentions that little detail....or more wisely ignores the Guardian of Forever, with a footnote to starfleet about a certain system to put a 'Do Not Enter' sign on. Time Travel is such a fragging headache and really has been run into the ground in Star Trek 1.0. Let's just hope the concept is ignored from now on in Star Trek 2.0.
As far as technological advances....if Spock Prime details out the lineral progression of technological advancement over the furture hundred years or so, while some theories might be implimented if a form of hardware for the new idea is not required, it's going to take some time to tool up for some of the more advanced tech. the federation might havea brief edge...but that's going to go away as the surrrounding empires take notice and tool up accordingly.
and given the loss of Vulcan, The federation is going to be very twitchy...which will make the Surrounding empries very nervous.
Interstellar Cold War Redux is probably what will happen
A brave little theory, and actually quite coherent for a system of five or seven dimensions -- if only we lived in one.
Academician Prokhor Zakharov, "Now We Are Alone"