The Gary Francione countermovement offer the same analysis. See HERE. It seems that the welfare corporations grasped back the initiative in the animal movement. For example, between the two marches, the once radical People for the Ethical Treatment of Animals (PeTA) began their deradicalisation into a large welfare corporation. In 1992, for example, PeTA's Ingrid Newkirk took the reformist line against the abolitionism of Regan and Francione in a famous Animals' Agenda article - see HERE.
In the 2007 interview, Regan still held a critical view of how the animal movement had developed, saying that the most powerful national organisations had adopted a "corporate business model." He called for the democratisation of the movement away from the dominance of the national groups.