I mean since Wiccan has the same powers as Scarlet Witch why not add him to the team. He could be very useful in reversing the affects of M-day.

That'd be really epic to seem him with the x-men to help with M-day..

I think he'd more likely be a lab-rat than a lab-partner...  Experiment on the son to understand how to undo the mistakes of the mother.

That still makes him a member of the team. 
But yea it would be epic to see him joining to to help undo M-day

It might be interesting to see him join but he doesn't  seem to have the same powers as his mother. At least not so far.

" I think he'd more likely be a lab-rat than a lab-partner...  Experiment on the son to understand how to undo the mistakes of the mother. "