I seriously doubt that the 12 rounders are gonna go anywhere. unless local laws are being proposed near you.
I've also done that same move but not for the same exact reason. I got a 422 awhile back since it had 2 mags with it and i could use the mags in my model 41. they also turned out to be 12 rounders so it was win win.
I think it really sucks that guns aren't coming with multiple mags... Kinda bugs me. Two should be the minimum.