He's definitely alive. They can't just kill Joyce's boyfriends every season.
Sure they can... She will be the new black widow! Just saying!
By the way, did anyone else pick up the "sudo" time shift at the end of the last episode? First they were packed, then they were packing again, then they were packing and leaving? It almost felt like we could see a time shift or something along those lines in the series, which might explain why she doesn't have her powers right now... maybe... just a thought.
I have a feeling if he is alive, he is in the upside down world or looking at my above statement, he is in another time/universe.