The value proposition here is indeed quite odd. In particular I would have thought the person paying extra for a better seat would be quite interested in being able to pick that seat!
Anecdotally C+ already seems to have been selling quite well and the erosion of the PM benefit is well underway. On a number of flights this year booked reasonably far in advance C+ has been completely sold out or middle seats only, while exit rows were still available. I wonder if the consultants are actually modeling the impact on willingness to participate in the status rat race.
I am not so opposed to unbundling (which seems to be a bit of a bogeyman around here) and there especially seems nothing wrong with being able to choose restricted/changeable/refundable in any cabin. What they are doing with these Experiences however is constructing new and weird bundles of attributes that nobody ever asked to have put together.