The main thing in football is to be motivated. You have to enjoy your football, to train, to run to put yourself in the media spotlight. I f Jack is still enjoying playing for villa, and he believes in the project, and villa will back him with a contract that equals to what he is worth then he will stay.
I think I remember an old interview where his father said yes he is a villa fan and wants to play at villa but not at all costs. It has to be on a contract that reflects his worth. I think a lot depends on if the club will pay it.