Not trying to advocate for anything but just listing all the possible QB moves that are out there, we only have Griffin (1.65m) signed for next year.
2020 Free Agents
Going Nowhere (getting signed/franchised)
Dak Prescot
Ryan Tannehill
Likely Starters for someone
Jameis Winston
Teddy Bridgewater
Tweeners - Might get a shot at starting
Marcus Mariota
Blake Bortles
Nate Sudfeld
Case Keenum
Geezers - One last hurrah / Bridge Guys
Tom Brady - ??
Drew Brees - going no where
Eli Manning - likely retire
Philip Rivers - likely retire
Clipboard Holders - Bridge Guys
Mike Glennon
Blaine Gabbert
Colt McCoy
Chase Daniel
Jeff Driskel
Brett Hundley
Trevor Siemian
2020 Cut / Trade Options
Matt Stafford - Possibly traded if the Lions want to go with QB @ 3
Cam Newton - cut or trade possibility with regime change in CAR
Andy Dalton - likely cut
Nick Foles - trade possibility
Jacoby Brissett - Trade candidate? Seems the Colts may not be sold on him and move on
Derek Carr - trade? seems unlikely but chucky is insane so who knows
Mitch Trubisky - not that anyone would want him, but he may be on the move
Josh Rosen - like Mitch, may be on the move but proven trash
2020 NFL Draft (likely available at our first pick or later)
Jake Fromm, QB, Georgia
Jacob Eason*, QB, Washington
Jamie Newman*, QB, Wake Forest
Kellen Mond*, QB, Texas A&M
Steven Montez, QB, Colorado
Jordan Love, QB, Utah State
James Morgan, QB, Florida International
K.J. Costello, QB, Stanford
Nate Stanley, QB, Iowa
Tyler Huntley, QB, Utah
Jalen Hurts, QB, Oklahoma
Lots of others, but not going to list all the fringe guys
Anyone else I'm forgetting? That's a boatload of options out there, from going straight to an NFL veteran starter to career backups that haven't gotten a shot yet and a boat load of college guys to look at.