I think Paradox might find itself in difficulties if it decides to release any CK3 game with the original timeline. The genie is out of the bottle, as many fans of the game love the earlier starts, which have added a lot of things such as pagans in the west, & the world being so much more diverse. The only way they might be able to get around this is by releasing a game that added the period before the middle ages of around 1066.
I personally would like to see all their games reviewed timewise. I would have a dark ages game until 1066, starting after fall of Rome, with Imperator before that. I feel the standard CK2 end time is to late, & should be in EU. EU should start around 1399 or 1356 as in Meiou & taxes & end before revolutionary period. Bringing the industrial age from around 1789 into a Victoria type game, which could end after first world war period. HOI could then start around 1920 to its present period. Obviously, this my opinion, but EU in particular needs an overhaul, as hardly anyone plays the late game