Eli will be a pretty good litmus test for HOFers going forward, assuming he rebounds from this. Clearly he won't measure up to his peers in any meaningful way individually. He will have good counting totals, but they won't be all that impressive given the era he's played in. It's kinda like baseball, there are non-steroid guys with numbers that dwarf HOFers from decades ago, but because of all the analytics we have in baseball (park effects, ERA+/OPS+, etc) we can see some of these guys weren't truly great. One thing for sure, he's got to turn it around or he may be in trouble... he's on pace for 40 interceptions. If 2011 was his last decent season there's no way he gets in.
For the record, I don't have a problem with Eli in the Hall... it is the Hall of "Fame" after all. I'm okay with decent players who played big parts in the history of the NFL being in. It doesn't have to be some elite shrine (for me anyway). Not to mention if it is supposed to be an elite shrine, they have to kick a LOT of people out.