I wonder if the US will ever move to international paper sizes? I would have thought this would actually be an advantage to (American) product manufacturers mak

I wonder if the US will ever move to international paper sizes? I would have thought this would actually be an advantage to (American) product manufacturers making printers and photocopiers. Would it not simplify product offerings if A4 was used instead of US Letter? Plus you get the advantage that A4 scales up perfectly to A3 and scales down perfectly to A5.