should a third-party acquire control over chrome’s development, mv3 gets shredded. restrictions and limitations on adblockers get scaled-back or reverted outright.

That is far too optimistic. If the courts force a sale then a for profit company will but it expecting a return on investment. Which very likely means more monetisation efforts like embedding ads or even more tracking built into it. It is a fantasy to think who ever gets it will scale anything you dislike about it back.