You will probably know it,but I will make just an assertion.
1000 years after the events of FFX-2 Shinra's offspring travel to FFVII's world and start taking advantage of the Mako energy.It is stated in the game [FFX-2] that Shinra could make the energy of the farplane to give power that can be used by humans,but that could take many years to accomplish.
It is official that FFVII is the continuance f FFX's story,
See here
and if you don't believe the translation of FFVII Ultimania Omega,go and purchase it,if you know Japanese,and find out yourself.
I am an admirer of this idea,because these two Final Fantasies are my second best,and I am looking forward to what they'll do in the future.
I know many will take this as a ''bad thing'' , but try to keep an open mind,and if you really like F.F. give the people that granted us these masterpieces a chance to express their talent.