You shouldn't have any problems with propagating Monsteras and having them grow new roots. I would just go ahead and pot it up in a fast draining soil, give it some bright, indirect sunlight and water, and it will take care of the rest. There's no need to root them in water first.

I find that once it has filled in every nook and cranny with as many roots as possible, then those potted roots stop growing. It will continue to send out plenty of aerial roots though.