With the exception of UT's recruiting woes I'm not sure why they think this is a new trend. At least on paper, the B10 has been out recruiting the B12 for years. This is because the B10 schools themselves, from an academic standpoint, have more of a national footprint. This has spilled over into athletic recruiting as the more geographical diverse student populations has been a selling point.
A story I'd like to see is how technology has effected recruiting in the B12. I've had a theory for years...actually based on when I started folllowing recruiting (years ago) and noticed the B10 was consistently out recruiting the B12 on paper but not necessarily out performing them on the field. My thought was that due to the relative lack of depth of talent in certain states it was actually leading to those states being severely underrated by the recruiting services and even the coaches themselves. Because both weren't spending a lot of time poking around those states they were missing out on the talent that was there...talent that was feeding the local programs and would be national recruits if they had more exposure (and thus would have been rated higher).
However, today anyone with internet access and a cell phone can distribute film cheaply and in mass. Add to that, technology led to the creation of the fan sites/networks which led to things like more regional camps/combines, etc. But it is not only the fan sites...there are now multiple trade (for the colleges use...not fan consumption) sites which are essentially databases so that the programs have instant and extensive information on recruits around the country (a school can literally do things like query 6 foot, 180 lb CBs that have timed a 4.4 and have stats, film, contact info etc. of kids from all over the country including the more remote locations). There are other examples of how technology has changed recruiting but my point is that it has led to way fewer "hidden gems," programs being able to identify and connect with talent outside of their "500 mile radius" much easier and thus the weakening of programs and conferences that relied on talent in their footprint being relatively ignored.