I doubt that. MCPs are broader. You can serve a Skill via a MCP but the reverse may not be always true.
For example, you can't have a directory named "Stripe-Skills" which will give you a breakdown of last week's revenue (unless you write in the skills how to connect to stripe and get that information). So, most of the remote, existing services are better used as MCPs (essentially APIs).
It does code execution in an apple container if your Skill requires any code execution.
It also proves the point that Skills are basically repackaged MCPs (if you look into my code).