"You're golden." Indeed you are: you can use Haskell and GHC and reap the benefits of programming language and compiler experts. You can read the slides again

"You're golden." Indeed you are: you can use Haskell and GHC and reap the benefits of programming language and compiler experts. You can read the slides again and see that many things explained there are possible with GHC and don't require Mu. I guess you can make a similar comment about PHP and Facebook. Facebook do have experts in compiler/interpreters to change the language/implementation to make it good at their scale.