I strongly doubt there will EVER be a free-roaming game that allows you to travel to different time periods. Just think for a second about what the game would have to take care of and you'll see it's just not possible. Let's take GTA-gameplay as an example, since that seems to be what a lot of people want. First of all, the game would have to record and store EVERY player movement from EVERY point in the game, plus EVERYTHING around the player for the simple reason that it would have to be replayed, should you chose to visit that same time again later. And then WHAT should the game do if you smashed into your own car from the previous visit? Should it create a dent in your current car? Should it assume a paradox and fade you out (having changed the past, you may never have travelled to that time again)? There's just no way to handle that kind of interaction, and I doubt there ever will be, no matter the computational power at hand. It's just way too complicated. It's always easy to say "I would like...", but just think about it for only a few seconds. I don't see it happening.
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