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I hate to say it but, I think the future of MMOs should be on the next consoles.
I know a lot of people hate the idea of MMOs on consoles, but there is no need to make a game for a controller only and a Mouse and Keyboard should work on next gen consoles.
Inherently, the main advantage the consoles have is 8 gigs of ram. The sad reality is no one is making games that are only 64-bit apps yet. 32 bit apps, even on a 64 bit box, have a default maximum of 2 gigs, in Windows. That can be increased by making the app large address aware.
At the end of the day though, developers are building games with only 2 gigs of available memory for PC. The two next gen consoles will both have 8 gigs available and I have to assume that is because they will be coded for greater than 32 bit apps. Being able to load 8 gigs will be a huge benefit in making seamless open worlds. Having ~4x the amount of available ram is nothing to sneeze at.
I think it would wonderful it developers would start making games 64 bit only. I just don’t see it happening in the near future. Consoles give hardware/software standardization. This along with the greater memory should allow for huge open spaces and limited loading. Two things that should be standards in MMOs.