Answer:
If you do not expect to stop the vehicle, then yes.
Your front brakes provide up to 80% of the stopping power of your braking system. Without them, you would NEVER be able to stop your vehicle in anything resembling a safe amount of time. PERIOD! Not to mention, you would probably be replacing your rear brakes every week if you managed to put enough pressure against them to stop your vehicle at all - AND you would ruin your calipers on the front from not having the pads in place to keep them from hyperextending - which would also cause brake fluid loss, which would keep your rear brakes from working.... So, bad idea.
Do *NOT* EVER drive a vehicle that has no working front brakes. Need I say more?