From what I've seen almost all pros land on their non-dominant foot today. Go back before 1970, when one foot had to stay on the ground during the serve, and everyone "stepped" into their serve - the non-dominant foot stayed touching the ground and the dominant foot swung into the court.
Becker was a modern player who landed on his dominant foot, and his serve was OK
So, it can be done, but even in the late 80's he was unusual. Sampras, Edberg, and other S&V players all landed on their non-dominant foot.