The issue is that you don't know if Hurts is the guy or if Sirianni is the guy. You definitely have to separate them to make a decision. IMO, we have a lot more of Hurts information than we do of Sirianni. If you want to say that the Hurts info proves he's not the QB, then I will slightly disagree, but I understand where that comes from. All the team has invested in Sirianni is money (and I guess you could say the time for Hurts, or a new QB, to learn a new system). To make a switch at QB involves much more team capital than to replace the coach.
I know there are outliers in football, but to draft a franchise QB you really want to be in the top 5. The Eagles just aren't that bad of a team and it will either take a lot of players/picks/money to get there or they will have to be really bad for a few years.
That was a good post, btw.
EDIT: This also isn't the worst year to draft a QB, but my initial thought would be to draft some players that normally wouldn't slide in a non-QB year (like last year).
EDIT #2: The is Hurts' 3rd year. You have to make a decision on Hurts after the year. He was a 2nd round pick so next year will be the last on his rookie contract.