@DEFCON 1 We already had the 4e FR campaign guide for the 100 year leap, 5e book would update another ~15 year after that.
But regarding a 100 year leap... Sure things happened... But were they that earth shattering? Let's take 1900 to 2000: Two world wars, cold war, atomics, flight, automobile in general use, coastlines have changed, large pandemics... OK, nevermind!
No the issue isn't that things change in a 100+ years, the issue is the 100 year leap in the first place imho.
1987 - FR1 boxed set [DR1357]
1993 - FR2 boxed set [DR1367] 6 years RL => 10 years in game
2001 - FR3 campaign book [DR1372] 8 years RL => 5 years in game
2008 - FR4 campaign book [DR1479] 7 years RL => 107 years in game
2025 - FR5 campaign book [DR1494?] 17 years RL => 15? years in game
Honestly, the progress from 2e to 3e was best for me.