Maybe you need to take some time off completely if you're this burned out. Go travel and come back to software and life in a few months to a year. Maybe you'll be inspired to start something new, or maybe there will be something completely different you'll want to do.
You'll always be the creator of Capistrano and for this your reputation will live on. If you've got clients that love you, your business will also thrive. I think your fear of letting go is probably unwarranted, and in any event your happiness should come first.
Have to second this; your love and dedication is too much to lose, both for the community and for yourself. Take a break, ignore the haters, stay happy.
You'll always be the creator of Capistrano and for this your reputation will live on. If you've got clients that love you, your business will also thrive. I think your fear of letting go is probably unwarranted, and in any event your happiness should come first.