Despite the obvious partisans in the Senate, by the time AOI makes its way up the chain, the Senate would presumably have a Republican majority and may very well unseat BHO. The only case I could see for not bringing AOI would be that the trial very well could elicit a Democratic surge in the polls this November.
What is your thesis?
There is no realistic scenario in which the Republicans gain the 67-seat supermajority that impeachment requires.
The Dems know the threat will exist if the Republicans get the Senate, anyway. Do not think for a minute they won't vote early and often, and bring out the dead vote and the illegal vote in droves. Every fraud imaginable will be pulled on an unprecedented scale, even worse than the last election--and that was likely unimaginably massive.
With Holder in position, NOTHING will be done about it.
One thing the AOI might do that just isn't happening at the moment--and that's energize the Conservative vote. The perennially disgusted would have reason to believe at least, that some thing might get done in opposition to Obama instead of Kabuke and bidness as usual.
At present, there is absolutely no indication of effective resistance on the part of incumbent Republicans (with rare exception) and little reason overall to continue the farce.