The Fromm-Fields-Eason thing is interesting. I think UGA played it safe - Fromm helped win games, so don't mess with the success.
Yet both Alabama & Clemson - top programs - had Fromm-esque options starting at QB, but made the risky-ish change to a higher ceiling, but less known. I believe they both did so because they'd been at the top of the mountain for a few years. UGA was (Aug of last year) arriving and didn't want any additional risk.
If UGA had been a top program the previous 4-5 years, I say Fields stays and starts over Fromm, a la Bama (Tua) and Clemson (Lawrence).
SO, I find this interesting because each thing is slightly different.
Clemson was kind of easy. Bryant was just fine. His starting year he was 66th in the country in YPA. He was a plus runner, but not a great one. It was kinda clear more talent could edge him. Lawrence is maybe the best QB draft prospect ever. This was kinda easy.
Bama was a little messier. Hurts was a top-25 guy in YPA. He was a high end plus runner. He led an offense that was 16th in points per drive and the best at avoiding turnovers in the land. The team only turned to Tua in desperate straits. Bama didn't give a super talented Tua the job until it had a title on the line and needed something (and after that, it was easier to bench). In retrospect, Tua probably shoulda started sooner, though it's not because Hurts was all that lacking.
UGA is this other kettle of fish. Eason has the ceiling, but his floor and average play are not very good. Fromm, I can't tell if he's a supercharged Scott Tolzien (gets the ball to the right spots, won't make more than a few plays that pop), or high-end pro-style passer in a system that makes him seem like a cog. Likewise, I can't tell if Fields is hyper developed or if OSU's system is good at making guys look good. I had the sense Fields looked a little rickety at times last year, though the numbers don't back that.
I mean, Lawrence beat Bryant, or got close enough they knew he was beating him soon. Tua beat Hurts eventually. It never quite seemed like Fields did THAT well last year, or made it close enough to split the difference.