You can limp home without a clutch, however if you break your throttle cable, you are pretty much stuck.I learned this lesson a couple weeks ago. It was really hot waiting in that parking lot for the local HD/Buell truck to come get my bike. When the guy showed up, this was the convo:
Greg: Hi I'm Greg. Broke yer clutch cable huh?
Me: Yep
Greg: Mah new bike's got one o' them hydrolic clutches.
Me: Good for you Greg. Good for you.