I wouldn't predict either names becoming overly popular anytime soon. I like
Matilda much better than
Alice. I think it is safe to assume you can avoid the nn
Ali for
Alice.
Alice is not too long or hard to pronounce-I would guess most
Alice just go by
Alice anyways.
Matilda is sure to get a nn somewhere. I think I like
Mattie best though. Hildy seems kind of butch to me. Not sure why. Tildy seems the same way.
Matilda by itself is nice though. I would try my hardest to keep everyone calling her
Matilda.