Anyone saying 'inherently unscalable' about a feature of a language that's used in as many places as C needs to really think about things...

I understand some of the objections, and the import mechanism doesn't sound like a bad thing, though some of the objections are weird -

Import only imports the public API and everything else can be hidden - who wasn't doing this for libraries or large code modules anyway? Have static functions at the code module level, 'private' headers for sharing functions within a larger logical module and public headers at the logical module or libary level. Is this too cumbersome?