The desire for a Pokemon MMO is somewhat mixed in the Pokemon fandom community, for good reason. It would be something of a big undertaking, and no two people have the same idea of how it would, could or ought to work out.
But I was thinking that us older Pokemon fans could form a company, work on the infrastructure and pitch the idea to Nintendo (and/or GameFreak). I figure that even if we don't get the opportunity to make "The" Pokemon MMO, we'll have the foundation set for a pretty good online game anyway. Plus the experience would be helpful, especially on a resume.
I don't have much in the way of computer experience, but I do have some entrepreneurial and writing skill. I have an eye for detail, and a love to see the fandom continue to develop grow and (possibly) mature, over time. If we can get enough hardworking, knowledgeable Pokemon fans together, I'm sure that more than enough would have the expertise, or the connections to make some headway. We'd probably even have loads of fun too!
I have a text file full of ideas that I think would be key in marking a genre change from single player RPG to online multi-player, while still being true to the heart and soul of the Pokemon franchise.
More importantly, I believe that there must be a way to structure a Pokemon MMO so that that handheld games remain lucrative for Nintendo. That is the only way that Nintendo would even start thinking of endorsing an MMO to begin with.