I agree about the QB being the key. In the last roughly 30 years, we have had 5 good QBs IMHO. Dewberry, Jones, Hamilton, Godsey, and Thomas. Dewberry and Godsey were awful and became very good as redshirt juniors. Hamilton just barely escaped being benched as a redshirt sophomore. Thomas, like Hamilton, hit his stride midway his redshirt sophomore year. Jones was good from the start as a redshirt freshman even though he lost his first three starts.
The point is that we have to develop QBs. Twice we signed the top QB in the country, Dudish in the 60's and Davis in the 90's. Neither worked out either thru their own problems or our coaches problems. Friedgen was obviously the best at developing QBs we ever had (Jones, Hamilton, Godsey), and Gailey the worst. (Want to know what might have been? Imagine either one of those three QB's throwing to Calvin and handing off to Choice for a couple of seasons and then despair at how unfair life is.) I wonder what Donnie Davis would have become with four years under Friedgen. Johnson seems to be good at getting the most out of his QB's capabilities at running the TO (Nesbitt, Washington, Thomas). You could say that Nesbitt and Thomas worked out very well for us. Washington gave everything he had, but it wasn't enough and that means that Johnson failed to get a good enough QB in his early recruiting (Sims, Days, Lee). Since most of our good QBs over the years, even under Friedgen, did not become good until their redshirt sophomore years or even later, I don't think we should be writing off Jordan just yet who has never played a down. Barring injury, we have a QB good enough to win 10+ games for the next couple of years. We should be looking at a R-Jr or R-Soph as his replacement. Historically, that is when our good QB's hit their stride.
Back to the OP's question. First, what constitutes a dynasty? To me, in the next 5 years, if we win 4 against uga, win 2 ACC championships, make the playoffs twice, never win less than 9 in a regular season, and win 5 post season games, we would have a dynasty. Especially when combined with last year. It seems to me that the odds of us having a very, very good run is as high as it has been since the 50's. The situations that bedeviled us in the past after good seasons about losing coaches, losing large numbers of players or our best players, poor recruiting, and lack of depth seem to be as good as they have been since maybe the 50's. If we aren't at the beginning of a dynasty now, then us Old Farts (50+) will probably never see one. I can only hope that whatever supernatural being it is that controls football destiny will not be so cruel as to rip the cup of dynasty away from the lips of this long suffering, faithful fan after only the briefest taste last fall.