Measurements in F# is an exciting feature. No doubt about it. I was really impressed when I learned about it being added to the language.
It surely addresses a lot of potential issues with measurement mismatch.
Yet, run time support for measurements still makes a lot of sense.
If you are reading data from external sources at run-time (files, sensors, or web services), you'd still have to implemet all the measurement tracking and conversion yourself. If this can be married to contract somehow, then application would just have to
tell the framework that it expects mass to be in kilos, and if input feed turns out to be pounds then conversion would happen under the scene.
Another presumably useful feature would be to declare measures off of classes/types. If for example, I'm counting my chicken, I don't want to be able to inadvertently add this to the count of eggs, unless I explicitly coersed chicken and eggs to be "things".
Anyhow, compile time support is a very good start.