Sure, it's being actively developed, but I haven't really heard of it being used in big production systems, which could indicate the community's interest has moved on.
Not that this is the definitive answer by any means, but simple measures like SO trends suggest that the community has moved on a bit[0].
Obviously I don't think that's definitive proof of Meteor being dead, but usually it seems like that's an indicator of declining new interest (which leads to extinction over time).
For another example, while I wouldn't say Backbone.js is completely dead[1], it's hard to pretend that it hasn't been largely supplanted by React and ES6, and Backbone probably doesn't have a bright future. There's undoubtedly a community around it still, but I would be shocked if that community doesn't get smaller each year.
I don't doubt that Meteor will continue to live for quite some time, but I think there's valid reasons to suggest the community will continue to shrink.