If teams 5-8 need to get in to keep everyone happy, fine, I'm not necessarily opposed to that. I defend the committee picking the right teams under the parameters that are set, not the parameters themselves, which the committee has no control over.
I'll say this though as it pertains to TCU. Our chances of winning a national title are better if they keep it at four teams than if they expand it to eight. The Alabamas, Ohio States and Oklahomas of the world are better equipped to withstand a 3-game buzzsaw than a team like TCU, unless we can start recruiting at an equal level to those teams. The difference in the depth within the rosters is pretty substantial. Much better chance for TCU to get in by going 12-1 or 13-0, hope a couple heavyweights get knocked out via the regular season, and have to win 2 games instead of 3. Expanding to 8 will only serve to ensure the Alabamas and Ohio States are in basically every year, and as much as we like to say those teams aren't that good, playing them on the field presents a whole different matter.
One other thing, you say that the results of yesterday's game proved the committee "got it wrong". How so? Alabama was really the only controversial pick and they proved them\y belong, didn't they? I mean, if the outcome of that game was reversed everyone would be saying Alabama shouldn't have made it. It goes to show in some people's mind the committee can't be right in any scenario, which is stupid. And if they would have set up an all-SEC semifinal, I guarantee you the narrative would have been that ESPN set that up to guarantee an SEC made it to the Title game. There is literally no scenario in which people aren't bitching about ESPN and the committee unless their team makes the playoff and wins it all.