So assuming we could afford it. Why would Manning not come here in 2012? What made the Broncos more attractive than the Lions in the eyes of manning?
In my opinion, Manning would have never come to Detroit if offered even something remotely similar (contract wise) by Denver. If you remember, Manning chose Denver over San Francisco, who pushed so hard for Him they ruined their relationship with Smith and had to trade him to KC...SF had just gone 13-3 that year. If San Fran couldn't close the deal, I don't think Detroit (even if they tried their best) had any chance at getting Manning.
I think Manning chose Denver for a few reasons:
1. Denver had a terrible QB - one of the worst ever, and as a result had a very under performing offense, even though there were tons of weapons on the team (Decker, Thomas, etc.) Their Defense was average in 2011, but Manning had to think that he could make a dramatic difference on the offense with him at QB.
Detroit in 2011 had a top 5 offense already - and a below average Defense...Manning no doubt would have produced in Detroit, but a top 5 Offense can only improve so much (in theory). They still would have a bad Defense, and so it wouldn't have been the ideal situation (which is what he was looking for).
2. John Elway - He had a lot to do with getting Manning in Denver. I don't think his impact can be overstated. Meanwhile the Lions were run by the same fools who run in now, and had a defensive minded HC in Schwartz (who I'm sure a Pro's pro like manning wasn't too found of).
3. The AFC West was a much 'easier' division than the NFC North. The NFC North had the Packers at their peak (2 years removed from SB) to contend with, and a feisty Bears team as well. Lions with Manning would have been the favorites I think? But still not a shoe in like Denver was with Manning.
This is just my opinion though....