I don't disagree with that at all. But that's how the chips fell for him, hopefully he's mentally strong enough to get through the benching. I'm not of the belief that EJ is done in the NFL and he may still bounce back. The problem is if he's not mentally strong enough to recover from the lackluster start to his career. EJ hasn't even started a full season yet.
Geno on the other hand already has more starts under his belt and it looks like he will continue to start. He's already at 21 games started compared to EJ's 14. All i'm saying is that if Geno continues to start this season at the expense of the rest of the team and he continues to perform as badly as he has that's 2 years of games you have as a sample and the odds are definitely against him turning it around significantly (as can be seen by the lack of recent examples of QB's who have started 2 seasons, were bad, and then ultimately turned it around).
Stafford went into his 3rd season with only 13 games started due to injury but had shown flashes as he had 19TD's through 13 games. Though he did have a lot of INT's remember he inherited an 0-16 team when he was drafted. My point is that he had flashes of greatness his rookie season throwing 5td's in one game. His injuries were a bit of a concern but so was that horrible O-line but I don't remember reading any articles at the time saying he was a bust.
Geno (and EJ) have not had any flashes of greatness yet - they've been "OK" some games - but neither one of them have had that wow factor yet that leads people to think that there may be something great there. More concerning for both (especially Geno) is their regressions in their second year.