Remember Mike Vick or Kordell stewart or Donovan McNabb or all the rest of the so called running QBs who are the future of the NFL, didn't think so.
Don't forget RG III,,,,,,,,,,,,,,,,,,,who is now our back up
Yeah, we have those concerns also,,,,,,,,,,,,,,,,,,,,,or at least we did. Too much fun right now to worry about the future
As to your list, don't remember Kordell Stewart, but I have only really been paying attention to football since 2000 and then only semi seriously for the last 8 years or so.
Realistically, you are right, if Lamar gets seriously hurt, we are a middle of the pack team
But whatever shakes out, come spring time, ,,,,,,,,,,,,,,,,,,,,,,,,,we have the Orioles