You guys woke me up for that? (just kidding) :)
There are no plans in place by EA that anyone who would know what they are talking about are willing/able to discuss to make a 64-bit version of TS3 for Windows. There is a "soon" to be released new version of TS3 for Mac that by definition has to be 64-bit because the current Mac operating systems will not run 32-bit apps any longer, it's showing up for many players now as a placeholder within Origin with no download available yet, and that's pretty exciting. But that's Mac-only, not Windows.
The issues with Isla Paradiso can be fixed, they aren't resource related if the player has a strong enough system to carry the EP. It's the world that is flawed by design in several places. The world is not likely to run any better, unfixed as it comes, if it just gets more RAM to work with.
https://forums.thesims.com/en_US/discussion/811253/removing-ip-lag/p1
