Solid In: Michigan, MSU, Iowa, Wisconsin, Ohio State, and Minnesota
On Bubble In: nobody
On Bubble Out: Illinois and Indiana
Not on Bubble: Northwestern, Nebraska, Purdue, and Penn State
Yes I have Illinois on the bubble (out), keep in mind there is a lot of basketball left to be played as we are only 1/2 way through the conference season. Illinois still has a respectable RPI and can still make a run.
Here are there next 4 games (with RPI rank):
13 Feb. 4 Wisconsin 9:00 PM
96 Feb. 9 @ Penn State 4:15 PM
66 Feb. 12 @ Nebraska 9:00 PM
19 Feb. 15 Ohio State 8:00 PM
It is still possible they make a run in the next four games and it could start with a win over Wisconsin on Tuesday.
Indiana does not have a bad loss (a loss to Notre Dame is close) and now has wins over Michigan and Wisconsin. With todays win I have them squarely on the bubble and they might be one of the "next four out".
Any of the remaining 4 could also make a run and get into tournament consideration. Every team in the Big Ten is in the RPI top 100 so a run by a team like Nebraska could get them into tournament consideration. Purdue probably has the most work to do since they are the highest RPI and do not have a win over a top 50 team. Penn State also has a couple of bad losses to overcome (lost to Princeton and Bucknell).
This season has been crazy so I would not count anything out.