I've seen similar thinking bandied about by Iowa State fans and the logic doesn't hold that well. Sure, none of those teams are very likely become a national power but for some reason some of you guys think the non-elites of the Big 10 are going to have to play all the blue bloods every year. That's not how any of this works. At most they'll play two of those. To make the playoffs they'll probably either need to beat one of the two or win the other 10 convincingly. That's even assuming the elite schools mentioned are actually elite in the year you play them. Pretty safe assumption with Ohio State. Not sure the same could be said for the rest of them.
That's not that different from the pre-division days. Iowa beat both UM and PSU in 2002 and 2009 and lost to UM but beat OSU and PSU in 2004. You can go back and look at MSU's successful seasons and they'll have beaten two of the three as well. Same for Wisconsin. That's probably where the second tier of Big 10 teams ends (you can add Washington to this tier probably, we'll see on UCLA)
My point is I don't think the additions to the conference impact how many times each of those teams make the playoffs. When those teams have been really good, it hasn't mattered if the elite teams were on the schedule or not. The important thing is hiring the right coach that is actually capable of producing those teams. Fickell is playing a dangerous game completely overhauling Wisconsin's offensive identity but maybe it'll work for him if given enough time. I have my doubts but if he can win in Cincinnati he can win at Wisconsin. We'll see who MSU hires. Dantonio had some really good football teams so if they hire the right guy, no reason to think it can't be done at MSU. As for Iowa, I think Kirk has one more top 12 team in him, but not two. Then we'll see who the next guy is.
The mid level Big 10 teams have never been every year BCS bowl contenders so no reason to think they'll ever get to the point that they'd be every year playoff contenders unless one of them gets a homerun hire. But I also don't see why they won't be what they are now, where two or three times a decade you'll field a team capable of competing for a playoff spot.