Yes, but no. The SEC poaching ARKY is what set it in all in motion. Roy Kramer, then commish of SEC, wanted a 12 team conference with a championship game and thus Arky was one of 3 new invitees. Roy Kramer also the architect of the BCS, had that in place in few years after he initiated the bowl coalition for a couple of years. The modern 12 team conference and championship game with the BCS was Kramer's brainchild and poaching Arky from the SWC was the first step in the plan. 2 years after Arky was gone SWC disbanded and the formation of Big 12 happened.
While a lot has changed, but ARky leaving was the initial move and start of the conferences that are in the club and the BCS, while the others were now on the outside looking in.