I think the open source obsession is a bit sad. Open sourcing would mean an end to another entrepreneur and indie developer.

So, instead of open sourcing, I think these should happen:

1. He should get partners who can take care of Sublime Text if he isn't able to do it himself.

2. If Sublime Text is about to become abandonware, then it would be better to sell it to another small company, which could carry on developing it.