Cloud Foundry is closest to this vision, in my entirely biased opinion. We're already able to mount standalone installations on AWS, GCP, Azure, OpenStack, vSphere and others.
Distributing apps across multiple clouds is easy to say, hard to do. Each IaaS has peculiarities and wrinkles, different tradeoffs in performance and cost and so on. It takes a moderately tricky scheduling problem and turns it into a much gnarlier one.
What's easier is using high-level tools like Terraform and BOSH to manage installations on different IaaSes, and pushing apps to whichever one you like as you like. I can easily imagine setting up round-robin deploys.
That said: data has inertia. Any sensible architecture has to bear that in mind; typically apps will wind up living close to their datastores.
Disclosure: I work for Pivotal, we're the majority donor of engineering to Cloud Foundry.
Distributing apps across multiple clouds is easy to say, hard to do. Each IaaS has peculiarities and wrinkles, different tradeoffs in performance and cost and so on. It takes a moderately tricky scheduling problem and turns it into a much gnarlier one.
What's easier is using high-level tools like Terraform and BOSH to manage installations on different IaaSes, and pushing apps to whichever one you like as you like. I can easily imagine setting up round-robin deploys.
That said: data has inertia. Any sensible architecture has to bear that in mind; typically apps will wind up living close to their datastores.
Disclosure: I work for Pivotal, we're the majority donor of engineering to Cloud Foundry.