"as most releases will be self financed and self published"
Agree. But most / almost all of the successful releases will be connected (in one way or the other) to UMG/SONY/WMG.
"The majors will launch their own version [of independent A&R] once they realise the advantages thereof"
The major labels have used (independent) labels, managers, agents, music publishers, and external A&R-men for decades as talent scouts. In the 60s there was no infrastructure in Britan to be succesful as an independent: Chris Blackwell (Island), Andrew Loog Oldham (Immediate), Lionel Bart (Gimmick), David Platz (Fly), Dick James (DJM), Girogio Gomelski (Marmelade), Phil Solomon (Major Minor) etc.
had to go through the majors. This changed in the 70s when JK used Decca/PolyGram. But even Island and Virgin were sold eventually.
One of the major (pun indented) reasons for the many problems the majors had to deal with since the 90s was caused by the integration of the "independent" sector: By buying everyone the (then) big six destroyed the infrastructure they dependent on for A&R, market research etc.
"Also a&r will revert back to a music driven model rather than profit driven"
This points to another problem: The state of (the evolution of) music. Why hasn't there be a new trend/style in the last 20 years?
see Simon Reynolds' Retromania