'Rammed down the throats of the provinces'?? How? 
The provinces have had 2 years to prepare and they've been mostly doing that. They have several more months. Where's the 'ramming'?
Plus, of course,  NONE of the provinces have or will refuse the tax $$. So no 'ramming' there.
As to being charter-proof, we'll see. If it's your opinion against government lawyers, I know what side I'll bet on. And it IS just your opinion. And your example has nothing to do with reality in a legalised framework.