Would they miss you if you didn't show up? Would they miss your brand or your writing or your leadership?
If you work at the local fast food joint or the local library and you don't show up for work, do they consider shutting the place down? If you're on the team at the ER and you have a bad day, would someone die?
Everyone is capable of being missed. Most of us would be missed by our family if we secretly moved to Perth in the middle of the night. The question, then, is not whether or not you're capable of being missed. The question is whether you will choose to be missed by a wider circle of people.
It's a risk, of course. You have to extend yourself. You must make promises (and then keep them.) More pressure than it might be worth.
Except when it is.