I would absolutely not take the pill. I am me, and I have no desire to change my gender identity.
TBH, I don't know if I'd have even wanted a pill that could change my body before I grew up. My first transgender feelings were childhood fantasies about a device that would change my body and "magically" (technological magic in my narrative) change everyone's memories so I would not have to explain the change. Well, it would change everyone's memory except mine. From the beginning, I have had a strong attachment to my personal history, and I would not want to forget or pretend I had never lived in a male body or filled a stereotypically male social role. If I could take a pill now that would change my body without the discomfort of GRS (etc), then sure. But my life has been wonderful as I've lived it, and I would not consider it an improvement to have been born differently.
I wish people would stop describing this hypothetical as a "cure." I think most people would be far less comfortable asking hypothetical questions about "curing" homosexuality, or "curing" people who vote Republican, or "curing" people with the wrong color skin. It's a flat out offensive word, and no amount of hypotheticals and scare quotes "cures" that. I'm glad your post, at least, was better phrased..