I think you can think of the worries associated with Crohn's disease as two kinds of worry:
1) will this dang disease cause my early death?
2) will this dang disease cause me humiliation or distraction because I will need a toilet at unpredictable times?
The answer to (1) is no. Crohn's, for most of us, will only make us miserable, not kill us.
The answer to (2) is probably. How much do you need to worry about this? I don't know - everyone's different. How much control do you have over your life? Can you design your life to include things like easy access to a bathroom? Or are you a person who must work in a controlled environment with limited bathroom breaks? If so, it's probably time to learn about adult diapers. Plenty of people here use them.
Eh, there's a lot more to Crohn's than needing the toilet at unpredictable times. I'd say it can be a genuinely disabling disease, and not just because you have to run to the toilet: it depends on the extent and severity of it.
As usual I agree with Jen on the matter. But I'm a pessimist who always sees the cloud behind the silver lining, so whatever... >.>