I don't have time at work to read through 9 pages of responses so I will just throw my opinion out there. I hope they put "not Allen" in.
Our offense is going to be rough this year. Our o-line lost three of its starters and no matter what that means our offense is going to take a hit....and so will our QB...a lot of them. Our wide receivers are KB / Clay and a collection of journeyman that only the likes of Brady could make look good. Our best RB tends to sit a third of the games and plays injured another third. He still puts up big numbers, but going back to my first point I don't see that happening. Finally, we are in yet another new offensive scheme. Again...how many is that in the last decade?
Whatever QB we put in there is going to get SLAUGHTERED. Teams are going to stack the box against the run and force him to throw and there will be pressure on 3 / 4 man rushes when they don't. The QB that wins is going to have to literally put the entire team on his shoulders and drag them kicking and screaming across the TD line if he wants to win. Personally, I don't think any of our QB's have that in them.....yet. Whatever QB you put in will more than likely get hurt / dismayed and otherwise frustrated and I don't want that QB to be Allen.
That being said, if he somehow becomes superhuman and just starts lighting it up in pre-season games (4 td's a game lighting it up....not 100 yards 0 / 0) then so be it. I just don't see that happening and I have seen too many decent QB's get destroyed in our system by o-lines / offensive schemes that were simply not ready for them. I have to think back to all our past rookie QB's and wonder if any of them might not still be in the league had they not been put behind an o-line made out of swiss cheese.
As one last note....I think one of the things Tyrod Taylor benefited from was an o-line that was finding its stride. They had some bad games (and we usually lost those) but the o line was really starting to make something of itself. Then we lost most of them. Good luck 2018 QB....your going to need it.
Edit: Also...I just want to say that the "fan" in me WANTS Allen to play because he is the new shiny toy.....I just don't want to break the toy the first time i play with it