I actually started Vue before I joined Meteor, while I was still at Google Creative Lab. At that time React hadn't caught on, and Angular 1 was still al the rage. It started out as an experiment with this idea of making POJOs reactive for data binding (so far I believe Vue is still the only one that implements this reliably).
We didn't really figure out what to do with Vue in relation to Meteor - the company didn't really seem to be interested in it. I once proposed to work more on Vue and make it an official integrated view layer for Meteor, but the founders didn't like that idea.
Eventually Blaze is being phased out and the framework is essentially moving towards React. I can see that as a reasonable bet from a business perspective, but for me personally it definitely was demotivating.