There is nothing stopping the Seahawks from drafting a QB just because they resigned Geno, so this handwringing seems ill placed.
The fact is, having a guy who you know can competently run an NFL offense is valuable to both the brand-new coaching staff and to any rookie QBOTF we hopefully grab in the process.
There is information and dialogue that Geno will be capable of sharing as Grubb implements his vision at the NFL level that a rookie would be absolutely incapable of doing.
...This also buys our rookie QB time to learn how to be an NFL player. Geno will just be learning the playbook. A rookie is learning the entirety of the job.
This is exactly the point I was trying to make earlier with the trucker analogy.
Geno has been with several teams in his career. I feel confident in guessing that those teams did not all have the same offensive system. So Geno has had to learn new systems and playbooks before. I'm quite sure that he will have no problem learning a new system. In a real sense, it's like learning another language, and the more experience a person has learning a non-native language, the easier it gets.
And just like I'm guessing that all the teams Geno has been on have not had the same system, I'm guessing that some of them shared characteristics and even some shared vocabulary. There may well be legitimate reasons for preferring a rookie QB, but being better equipped to learn a new system is not one of them (unless the rookie QB happens to be Penix).
Also, I'm unimpressed with arguments regarding Geno's age. I say this as someone who went through Marine Corps boot camp at the age of 35 and a half, and successfully served for about eight years before starting to fall apart. Admittedly, it gets harder to stay in shape as one gets older, but Geno spent years as a backup, and those years don't really count as wear-&-tear the way they would if he had been starting the whole time.
For the record, I don't say any of this as an argument for not getting a rookie QB. I'll be quite happy if we get one, and I still have full confidence in Schneider's and his scouting team's abilities to pick a good QB. I just don't see going with Geno this year in the same negative light that some here do.