I like my M&Ps, have a significant number of them, and have no desire to migrate to another striker gun.
I have a CMMG 9mm AR that uses Colt pattern mags I really enjoy.
I am envious of my friends who have 9mm ARs that take their Glock mags.
I think Wilson makes an AR that takes M&P mags, but it is $1800 and I am not that envious.
S&W does not make a 9mm AR.
That just seem like a peanut butter and chocolate kinda opportunity for S&W...