I think I prefer the paid-support model a-la RedHat. I think the OP makes a good point of this licensing possibly hindering uptake/contributions to the Meteor project. Just by virtue of Meteor choosing this licensing model, I've lost some of my excitement to try it out. I would most certainly use it for something commercial and because it looks so sweet I would be willing to shell out some $ for, say, some email support or maybe for some bleeding-edge features.

Having to worry about not being able to use Meteor in a commercial capacity without knowing the price-point breaks the deal off the bat. I'm a one man team and don't have the time nor resources to swim through legalities and pricing--I need to be writing code.

This isn't to say, though, that if I wanted to do something outside of the scope of a commercial app I wouldn't try Meteor--but who knows when/if that will happen.