I'm afraid I don't see your point. Docker, and some of the other new system tools seem like great products. I'm sure they make sysadmin's lives easier than when they had to run everything via custom shell scripts. It probably makes them more efficient, so you don't need as many sysadmins per server. But I don't see how it is ever going to reduce the need to less than 1.0 sysadmins. And just as it will make sysadmins that work for your company more efficient, so to will it make IaaS/PaaS' sysadmins more efficient.

As a developer, I have very little interest in administering databases, servers, networks, and so on. It's not what I'm good at, and it's not what I'm interested in, it's not what I know. That the tools now use Turing complete configuration language that also happen to be a fairly popular general purpose languages doesn't change any of that.

Certainly, the IaaS/PasS pitch isn't for everyone. But for those who are in the sweet spot, it is a very compelling pitch. Frankly whether or not the platform is open source doesn't really impact its appeal very much. At least from where I sit.