YOUR reality. Your perspective is every bit as biased against Tannehill as those you rail against sre fpr him. Your (and others) narrative that "you all feel that Tannehill is untouchable" is overblown. Are there extremes? Sure. Just like there are those who feel like Tannehill is no more than a backup in this league. It's insane, and lumping everyone together to that extreme is just not going to get anywhere.
I totally understand preparing for the future. I do. And it needs to be done.
Now, here are two questions, directly to you.
1) Who are you trying to convince that we need to upgrade? The front office has made it abundantly clear that RT is the starter for the 2018 season. The majority of persons on this board believe that RT is at the very least a capable starter with upside remaining. However, there are those who agree with your opinion that we are lacking at the QB position, and you can certainly commiserate with them.
2) If you don't feel that RT is locked in for the next three years, who is supplanting him? A free agent? The 2019 Free Agents are: Tyrod Taylor, Josh McCown, Teddy Bridgewater, Landy Jones, Tom Savage, and less appealing names than that. 2020 has a few marquee names, but most will be just one side or the other of 40. Draft? Maybe. But that draft looks the part of a very weak QB class. The best guy is PROBABLY Drew Lock, and I can't see him beating out Tannehill barring injury, and I don't think the Fins will be bad enough to select him anyway.
Now, I *do* think the Fins should draft someone unless David Fales morphs into the heir apparent, and I think a lot of us will be saying the name Will Grier in March of next year. But I don't see anyone taking RT's job in the next two years. Year three? Maybe.