I train with what the dog will work for. My older male would train with his toys. My new puppy likes treats. The trick is to use the treat to teach the behavior, but once learned don't give them a treat every time. Sometimes he only gets a pet and good boy. So, yes...he will do what I ask without a treat every time.
Sit was the first thing he learned. He will rarely get a treat just for sitting now, but he still does it when the command is given.