Is it just me or is Heroku mostly dead now? Most people I know have given up on "PaaS" and gone back to plain EC2 etc. It's just not that hard to spin up an instance and deploy a rails/django or whatever app, especially with Docker now.
I think its just you. Lots of people use Heroku, I have like 4-5 apps deployed on it, and I know quite a few smaller companies that were completely on it last I checked.