Hi there
Unfortunately, I do not think that EA will be producing other Sims 3 games on any platform. Sims is also not designed to be a multiplayer game and will never be. Though it would be quite interesting!
The Answer HQ is a place for gamers to help other gamers with technical queries and the like. Therefore, it would be better for you to post at the official forums or contact a game advisor directly: http://eahelp.ea.com/en/ . For help with navigating the site, see this: http://answers.ea.com/t5/Beta-Archive/How-to-contact-a-Game-Advisor-using-the-new-EA-Help-page/m-p/2161281
Happy gaming!