Why try fixing something that ain't broke?
One of the few things that has worked well are the international numbering plans and agreements. So why go messing it up?
There was a lot of thought put into the present plan. 852 (straight down the digital dial) for HongKong; 212 fast rotary dialling for a busy place like New York, as was 213 for Los Angeles (issued in 1947) surrounded by 323. Washington DC is 202 - a high number for an politically important but not, in 1947, particularly busy; 313 for busy Detroit.
44 and 33 were good numbers and undoubtedly assigned for their world (colonial) significance.
Areas with potentially high phone counts/populations were awarded single digits: 1 - North America (now less the Caribbean); 8 for China and Russia 7.
The agreement overrode politics, too. U.S. numbers couldn't dial Cuba, but Canada could through the then cable from Miami to Cuba. For the U.S. East Germany wasn't recognised diplomatically but nevertheless it could be reached by non-U.S. numbers through White Plains New York.
Who would have thought, numbers for international co-operation!