Man I think you guys are blowing this out of proportion. 99% of the American population probably doesn't know what New-Brunswick is aside from a City in new-Jersey. As for the Québécois, well they are too busy going to Parlee beach to stop in Welsford. And it's way too far of a drive for Upper-Canadians. So who's left? Nova-Scotians and PE islanders. Ohh damn they already know about the 'Secret crags'' of New-Brunswick. Guess the protectionism attidude didn't work against them...better do something about that guys!, maybe block off the Confederation bridge and flood the Sackville marshes!
A prime example of how Mountain Project won't affect Welsford is Clifton Maine. The are a bunch of routes of Clifton Maine on MP, yet I've been there twice and every time the crags we're filled to 0,01% capacity. The owner Don Nelligan practicly adopted us since he rarely sees climbers there!
Also, this May when we were at the ultra packed Kamouraska, I think every member of our group talked to Quebeckers about Welsford. (We we're a huge group) and I even made a beta post on Welsford in one of Québec climbing forum Yet, the rest of the Summer I didn't see anyone coming up from Québec randomly to get on Snakepeel and Rockstar.
And say what you want, but I've been to CL a lot this year and a bunch of times it was awesome outside yet there were 3, 4 cars max parked at the farm. If anything, CL is underused and that is why we need to clean routes, for lack of traffic on them.
My 0,02$ on the question. Again, I love the fact that MP makes a consensus grade, not just a sandbag grade or a soft grade.