I sent a support ticket in requesting if my team could be changed, I got this back.
"Miles (Pokémon GO)
Nov 6, 12:51 AM IST
Thanks for writing in.
I understand that you want to change your team in the game. I am sorry but unfortunately, it is not possible to change your team at this time. We have passed along this popular feature request to our product team. They agree it is something we should do in the future. However, we are working on getting a few other big features out first so we don’t have an estimate on when changing teams will be possible.
If there’s anything else I can do to help, please let me know.
It didn’t reveal anything big, however the fact remains that they are aware that there is going to be a feature which allows you to switch teams (at some point) and that they are currently working on “big features” which, could be anything from Gen 3 up to abilities.