Rationale for dropping ModuleImport syntax?

[Brian Di Palma]

Is there anything preventing the addition of a "ModuleImport" like
affordance at a later stage (e.g. ES7)?

I haven't done much development with ES6 modules but I've not found
much use for that form when I have.

Related to some other comments made in this thread, I think static
verification errors are a great idea.
I'd also like to echo the comments that ES6 modules seem well
designed, looking forward to native implementations.