Similarly, the four new schools you mentioned may be in for a rude awakening within a few years when they're playing in temperatures below 50-60 degrees in October & November. Weather can often be overrated in terms of impact, but add in the travel, the quality of Big Ten coaches, and overall spread of talent, it will likely be pretty difficult for most teams to sustain elite success (10+ wins) annually. Additionally, there is a significant difference between playing the likes of big bruisers in Minnesota, Wisconsin, Penn State, etc. and the fun and gun style of the Pac-12. I do look forward to the possibility of a Minnesota-Oregon matchup with PJ sitting on the ball for 45 minutes of a game. Though talent and speed may be enough to win, it will be a challenge to do so week after week.
FWIW - I expect a similar regression with Oklahoma & Texas. Since 2010, the program that has fared best in college football after a conference change has arguably been TCU. Most would not consider their success elite, but I can't point to any program that changed conferences as continually being amongst the top 10-20 programs annually. Flashes from A&M, Mizzou, Colorado, etc., but there has always appeared to be a regression after initial bursts into their new conferences from almost every program that comes to mind.