Heroku didn't failed, they have been a huge innovative solution for a world generation in of developers. As a CEO and developer myself, I do believe that the next gen platform would be based on a similar experience as Heroku, but on top of the best cloud service providers.
E.g: Qovery.com is the Heroku-like experience on top of AWS
E.g: Qovery.com is the Heroku-like experience on top of AWS
(I am co-founder of Qovery)