You realize that you dont just "grab a franchise QB", lol.
Half the teams in the league are looking for franchise QBs, they dont grow on trees. Also, just because you draft a QB in the first round doesn't mean he is going to be a franchise QB. Do you know how many first round QBs wash out of the league or become career backups?
Also, unless we totally bomb out this season and win 4 or 5 games, we are going to be picking in the bottom half of the draft. What assests are you trading to move up and draft our next franchise QB? To go from say pick 25 to a top 3 pick is going to cost you multiple first round picks and then some, maybe even a young probowl player. What if you mortgage the future and the dude you draft doesn't pan? You just traded away the farm and came up snake eyes on your quest for the next franchise QB.
My point is that its not as easy as you are making it sound. Half the teams in the league are looking for franchise QBs and have yet to find them. The norm is it takes time, sometimes a lot of time, for a team to go from one franchise QB to another. Situations like Green Bay are the exception to the rule. You dont go from one franchise QB to another seamlessly. More often than not, you have a long period in between franchise QBs. Buffalo is still looking and its been how many decades since Jim Kelley was there? How about the Rams? You know how many years they sucked once Kurt Warner hung up the cleats and just now with Jared Goff they are back. How many years did the Titans suck after Steve McNair left? They have Marriotta, but the jury is still out on him if he is a true franchise QB because he gets hurt every dam year. So they may still be looking. What about teams like Arizona? Miami? Cleveland? Do you know how many QBs they have been through?