As someone who watched almost every Denver game last year, I completely agree. It is baffling that Denver is so focused on upgrading the QB, when that position was the least of Denver's problems on O through most of the season. I am surprised that Elway seems to be exploring the Romo option. Indeed, even a good chunk of the Broncos' fan base--which began last season firmly in the "play Lynch" camp--now seems to be commenting on the various articles AGAINST signing Romo and in favor of keeping the current QBs and focusing entirely on upgrading the OL. A lot of the fan comments are quite supportive of Trevor. With that said, there did seem to be an undercurrent in some of the reporting last year that Elway was more of a Lynch guy while Kubiak was firmly in the Siemian camp. Now that Kubiak is gone, Elway might prefer to have Romo be the stop-gap starter while the team attempts to develop Lynch.
My biased and humble opinion, though, is that Trevor did amazingly well given (a) the truly putrid OL play; (b) the frequent complete lack of a running game; and (c) having to play most of the season with a pretty gruesome injury (Google a Grade 5 AC separation and look at the graphics, if you have the stomach for it). I think he has the potential to be a quite good starting NFL QB without those obstacles. For how little they are paying Trevor, I think Denver would be nuts to let him go. If Denver signs Romo, though, it would be better for him if Denver does trade him. He is good enough to start someplace.