If 8 conference games in a 12-game schedule become a national standard, it may become harder for TCU to get a "1 tough" OOC game on anything close to favorable terms. The "toughs", Ohio State, Michigan, and the SEC heavies, for example, will bargain for one-and-dones if not at their respective places then at JerryWorld. PAC "toughs" (I use that word lightly) are trying to schedule as their "medium" and "tough" games, teams from the B1G and the ACC, if their conference commissioner is to be believed. Not troublesome teams from the B12 or the SEC that are loss-threats and that might/will use West Coast appearances as an opportunity to recruit their local talent.
I understand that, with perfect hindsight, TCU would have been a "medium" for most P5 schools in the last few years. But TCU has been and has the potential to be again, a "tough". That, plus marketing considerations, could make it hard for TCU to avoid non-con schedules filled with not-so-successful opponents. Or one-and-done games away from home. Or teams that really can frequently be "tough", the Mississippi schools and Arkansas cross my mind, but won't move the needle nationally on TV ratings playing TCU.