[astine]

I'm going to agree with sho on this matter. If you provide something and give the impression that you will continue to provide it, you are partly responsible when people become dependent. You are certainly not required to continue to provide it, but you should at least give warning that those who were dependent have a chance to adapt.

When you quit a job or end a contract you ordinarily give notice. It's the same principle, and a matter of courtesy. --- That said, I've no idea what's really going on here, so I'm loathe to pass judgement.