Two seasons of awesome-ness, then a slow, grinding death before she was blessedly (as far as I'm concerned) taken away. In all honesty, I'd rather not see her return to the show.
Why do I speak such blasphemy? Consider first, the entire Johto arc wherein she was very nearly as bland as May. Three seasons of that was horrid, and I doubt a reintroduction would be much better, judging by the episodes she HAS appeared in since she left. The Housos were enjoyable, but I thought that the actual two-episode arc was painful, as she had become even more bland since leaving. I doubt that things would improve if she permanantly returned to the show. It is indeed lamantable, but true, I think. No amount of physical attraction can make up for what was lost emotionally. I shudder to think about what would happen if she did indeed return. I miss her, yes, but I still have P2K, the Orange Islands, and Kanto episodes stored away. That is who she truly was, regardlesss of any furutre appearances and returns. Anything else is a mockery of the wonderful character that I fell in love with.
Secondly, appearance itself. Consider how she changed between her leaving the show and temporary reappearance. I've already ranted, as has Kaga (see pg. 123) on how Maay is fanservice. Looking at Misty at the end of Johto and her return, she too, has become fanservice. It's sickening, and I don't want to see it. Again, I'm much happier without her returning to further destroy what hope I had of a strong-willed, independant female in a popular TV show.
*bows* Thank you for your time, everybody.