Well it's been going for about 5 years so far.
I have considered selling it simply because i don't really go bouldering any more. That said, i to tend to dip in and out of climbing and if i ever kick my nagging depression then i may start up again, so am going to hang on to it for the time being.
If it does ever get to the stage where I move on, then administration will be passed over to somebody else - it won't ever just die due to lack of care.
Similar questions have been raised over at ukcaving.com - i.e. if i was killed in a car crash or something, what would happen to the community? What I should really do is place all the access/hosting details with a trusted friend so that that eventualily is covered.