So, open source the code and make sure that the stuff that was built there stays alive. If you don't do that then anybody else trying to follow in your footsteps will have to deal with the 'remember what happened to zembly' stigma.<p>If you host something you'd better be prepared to be in for the long haul, and to have an 'end-of-life' policy in place before you even start.<p>In fact, people probably should not be using services that do not have an end-of-life policy.
SAAS FTL. We managed to avoid customer backlash by propping MSN Music open for an extra couple of years, but companies folding with user data is eventually going to sour public opinion of cloud services. It will probably take 5 to 10 years, so no worries.