Credit to Mr Trudeau. He has proven adept at managing the provinces.
How many people expected him to pull off a near universal Carbon tax agreement that left Mr Wall pretty much isolated and now the provinces are back to talk some more about Health care.

The provinces are playing from a weak hand on this one and they know it, There is nothing magical about the 25% figure touted by the remaining provinces. This has not necessarily been the standard in the past.. 

If I were a betting man I would put my money on a minor adjustment to the formula to let the remaining provinces save face and they will then sign on.