Going from 4 to 5 majors has devalued women´s golf. I hope administrators don´t try to do the same with men´s.
Major status needs tradition, player recognition, classic or great courses, and lots of money.
Countries not currently hosting majors that could have these qualities:
Australia, but it is English speaking (kind of).
Japan, up to a point
Korea, lacks tradition, recognition, courses
South Africa up to a point, do we count it as English speaking give it is 1 of several official languages?
Continental Europe, up to a point
Only one Spanish speaking country outside Spain has tradition, but has no courses, or money.
I would not screw up the majors. They are doing fine. What would really be interesting I think is to have a real WGC series, with maybe double the amount of events and leading to a special prize, and getting you in to the Tour Championship and Race to Dubai.
WGCs should be held in:
US
UK
Continental Europe (rotating basis)
Japan
Australia (Australian Open should be given that status)
Latin America (rotating basis with Argentina Open every x years)
South Africa
Rest of Asia (rotating basis)
On an Olympic year the Olympics becomes an WGC for points purposes and replaces the closest WGC of that year.