A.B.
My 27 month old just potty trained (day trained), and he is still in his crib. I intend to keep him there until he starts to climb out or be uncomfortable. It is hard to teach them to stay in the bed at night, and forget about naps if you switch! It's always easier if they are older.
He wears a diaper at night/nap and undies the rest of the time. We talk about how we wear a diaper at sleep times because he can't go to the potty. He's happy with that for now. Also, I was always very against using treats to potty train, but jellybeans worked for him. My husband started it, and after 3 days we "ran out" of jellybeans, and now he doesn't ask for them at all. It depends on the kid, and you have to be able to say no at some point. Good luck!