Once the contract is signed, the non-compete included, the funds transferred to the bank it's not my affair any longer. The only obligation to my ISP customers was to provide service month to month. Nothing more, nothing less. It's really the same with software, but there are variances of agreements. For example some developers may sign an agreement to stay on to help develop/progress the product along. These are usually 1-3 year contract agreements but often don't work out well in the end because the developer isn't ready to give up control.You may not care about that particular ISP but if someone criticises your works or moves what you have done while you were in that ISP business, would you respond? If yes, then why?
So the recommended method is a short transition, asset re-allocation, code handoff, and a small consulting crossover and then a walk-away. I've purchased and sold about a half dozen firms. (some well known, but I can't disclose without risk of revealing my identity) Either way. I am sure Dan can handle it just fine if the time comes.. VS is progressing very nicely these days.
My biggest recommendation for VS is to work out of the free model or at least begin to leverage it.. (Nags, banners, etc)