I would like to see this and other countries added too. In my opinion, the longer you wait to add a country to the database, the harder it is to go back in time and fill in the past shows. Or stuff gets forgotten, or overlooked, or whatever. The problem then compounds over time.
Maybe I am being naïve about the whole thing, but I don't see how this would be more work for the admins considering this is a site that largely relies on volunteers adding to the database. Vietnam seems to be adding quite a few shows, so it seems like it will be more work later on to build out the database if/when they were to add Vietnam than if you were to start now with a manageable amount of shows/movies.
And to the point of "the other databases need to be complete first", could that ever happen? I mean, realistically new shows are added all the time, so things cannot ever be complete. And some countries are so prolific in producing content that stuff is missed all the time. So that sounds a bit like an excuse rather than a legitimate reason. Or maybe the stated goal didn't come across clearly. Either way, I think clarification would be nice.