The goal should be to have teams who want you to be supporting them, not need you to be supporting them. Getting teams to the point where they don't need you isn't actually that hard. They might be only performing at 50% effectiveness, but that's fine if the work is getting done. You should build a relationship with the teams so they want you to support them to get to 90% or even more.

If your teams fail to function without your help then you're clearly not supporting them well enough, and you can't take a vacation or go off sick or be promoted. That is not optimal for anyone.