Is this a good idea for a video game?

It is pretty unrealistic and the game may need a few discs, but I think its a good idea. So my idea is a sports game were you can create a super athlete to play in all major professional sports leagues (MLB, NFL, NBA, NHL, maybe MLS). The game will give the option for the play to play in all of the games in each of the seasons. Also all of the money collect through contracts and endorsements could actually be used on yourself for a house, car, etc. It would take a lot of work, but I think it would be a good idea.