It's not a theory it's a hypothesis:
http://i.imgur.com/ujqSDHS.png
See whats written in big letters at the top? "Working hypothesis of PGD2's role in hair loss.
Garza/Cotsarelis wouldn't dare to argue like you that it's a "scientifically backed theory".
In fact Garza clearly describes:
"All the above is good evidence for the importance of PGD2 in the pathogenesis of Androgenetic Alopecia. T
he next question is the exact degree of importance. Is PGD2 the dominant agent which is downstream of testosterone and inhibits hair growth? Or is it one of many agents and itself only a minor contributor to Androgenetic Alopecia."
At this present moment arguing that PGD2 entails itself as a major contributor in Androgenetic Alopecia is a very weak position to be in honestly. I bet every hair loss researcher agrees with this including Cotsarelis. Nonetheless, you can start calling it a theory when you have very solid data to back it up.
"Hope", yes that works. People always hope. That's in reality whats dictating you thoughts, your feelings, not your rationality. There is nothing wrong with that. The funny thing is that you stretch this hope even further by hoping that you might maintain all the growth by dropping everything and then going on dutasteride. Keep your both feet on the ground mate, just start with your regrowth. I wish you luck.
Doesn't really matter even if the reversal was due to hair follicle cycle alteration of telogen > anagen, crude observations clearly show that reversal of miniaturization can happen extremely fast and almost in every case always does. The lucky transgenders who have massive regrowth in miniaturized areas are testament to this and also the lucky few that use practical regimens like finasteride & minoxidil.
It's not like like they have an improvement of like 20% in the first year then 20% in the subsequent year and then 20%, so forth. Nah the massive improvement almost always happens rapidly in the first year (of course I'm talking about a static regimen in the time frame itself).