I respect your opinion, but this isn't really up for debate. Contrary to what many believe, accuracy can be improved. For example: Romo himself said that when he first started he wasn't very accurate or that great at throwing the ball. And that it took him time to develop. I'll add to that that he was afforded the benefit of playing as a back up for years prior to starting.
Let me be VERY clear here.
I'm not hating on Romo.
I'm not comparing Romo to Prescott.
I also wasn't comparing JG to McVay.
And, I wasn't comparing Goff to Prescott.
You assumed I was, but it was a very specific and factual example.
So I'll put it in a general manner so we don't go off course here. QB A and HC B and QB coach C. If you improved B and C, A could improve dramatically.
And I certainly respect your opinion. If I put words in your mouth I apologize.
I don't think you were hating on Romo or comparing him to anybody.
You did, however, bring up the Rams. Yes it is a fact that Goff has improved and the offense as a whole has achieved far more success since McVay took over. And in terms of accuracy many things come into play. Footwork, mechanics, field vision and other factors are apart of that. I do agree that all of those things can be worked on and improved. Perhaps I should have made it in that context rather than stating accuracy in general. It is a fact that Dak has worked on all of those things. He has made it a point of emphasis to even the media. It is also a fact that his accuracy down the field has not improved and has probably gotten worse.
The big thing is talent and something that I also think we disagree on. Romo had more arm talent. I believe Dak has very limited arm talent. That is something you can't teach. He can work on his footwork, mechanics and field vision all he wants but in my opinion I do not think his accuracy down the middle of the field will ever improve. Atleast not enough to where he has sustained success in the league. It's obvious from his play that he doesn't trust his arm at times and it's obvious that he doesn't have the pocket awareness to stand in and deliver the ball down the field.
I hope I didn't get too far off the topic. To answer your question, yes, an improved Head Coach and Quarterback Coach could improve the play of a Quarterback in general. However, in this case when you are dealing with a Quarterback with limited skills mainly in my opinion arm talent, the improvement will be minimal and not sufficient enough to get the team where it needs to go.
Let me reiterate that I am staunchly in favor of firing this coaching staff. Getting a better staff in could only help Prescott. It all boils down to the question of whether or not you think he has the talent to play the position and have consistent success. I do not.