I can see how being able to say that gets a lot more people on board and that's a good thing. But effectively, if 75% of the members are subsidized by government (and subject to the rules and stipulations that government will probably tack on) I can see where the difference could wind up being negligible.
Initially the percentage of subsidized members would (probably be high). However if the cost to savings ratio is substantially lowered we will see many businesses dropping their traditional high cost plans and enrolling in the coop systems. If the cost of the coop plan is cheaper for me than what is offered through work I may simply join my local coop.
So over a period of time the number of non subsidized members will increase exponentially and if the system and services are applied properly you'll see the subsidies reduced to less than 5% over time.
Just the opposite of what a government public option would have created.
Of course all of this is moot until we see what the final bill look like.