Fisher was born in 1957, so 2023 would make him 66. The events that transpire in Conviction will precede this new game, and if Sam is still alive in 2023 during this conflict he' d have to have some other role.
Mitchell wasn' t supposed to be in Ghost Recon 4, so whether we can count GRAW2 as 4 or not, or whether the 4th game proper will see us controlling another character, ...or even whether Mitchell will stay afterall... ...i don' t know.
As for Team Rainbow, Clark retired and Chavez too over as Six and we played as Logan Whatever, but i doubt he' ll become a staple character in the universe.
Vegas and GRAW2 left us with cliff hangers, but out of the next en Clancy games only Splinter Cell and Vegas finished with a ' Too Be Continued...' screen, so maybe there won' t be a GRAW3 and they' ll jump to a different character and potentially timeframe for 4.
Vegas will probably get an GRAW2-esque sequel, probably this year, and that' ll probably set up events for Rainbows involvement further down the line.
It should be noted that Rainbow is based in the UK, so if they' re involved in the 2023 conflict it' ll likely be in Europe and not in the US like Vegas.
The Bible reference points to Armageddon, or the coming of the Apocalypse, which in this context would translate to nuclear war, probably World War III.
We know from the " transmissions" that there is fighting in Europe and fighting in the US, and we know that there is reverse migration, in that people who lived in the US bu came from other countries are leaving and going " home" because of the war.
We know that in GRAW/2 the plot revolves around an attempted invasion, and we know that Third Echelon [Splinter Cell] is mentioned in Act Three, solidifying that fact that both exist in the same universe.
Double Agent takes place in 2008, Vegas in 2013, GRAW and GRAW2 in 2013.
I suspect that Vegas2, Splinter Cell 5 and Ghost Recon 4 will all crossover properly and that they put out a flight sim at some point. In any case, they d need to start looking an new genres for the universe. Vehicle [chopper, plane or tank] sim, RTS or whatever.
I also suspect that 360 exclusivity of Splinter Cell 5 will be timed.