As Mike said, you always have an ONT. From that point you have your Internet, Phone, and TV connections. Perhaps you are referring to switching your internet connection from Ethernet to MOCA, or vise versa?
Yes, do it, yesterday. It's vastly superior in every way.
The only caveat is: if you do ever decide to utilize their TV stuff, you'll need to find an Ethernet / MOCA bridge and stick that into your network topology (to get the guides, VOD and such to work).