Now, for my thoughts: I think that the series should stay with the sequel that was hinted at in the end of Earthbound (hinted at as being shouted into your face.) Pokey should make a return. However, I'm not too sure if he should be the final boss. Pokey's just big and fat, and he got all of his power from Giygas. No final boss characteristics there... However, I think he could very easily be working for some other mecha-giygas-like boss.
Anyways, here's the rest of the fanthoughts.