I've thought about this a lot; given that men on both sides of my family were bald, I've assumed that I'd lose my hair at some point, and now it's started to go. I've always sort of liked my hair, so I've been surprised to find how little I care about losing it.
It comes down to this: I was flat-out miserable for all the years I spent pretending to be a woman. I'm happier now than I've ever been, and going bald is a small price to pay for that. Also, the receding hairline and thinning hair definitely contribute to my being read as male 100% of the time now, so there's that.