Yeah, they can't even sell much of their wine here....
In fairness to them, politics aside, I think a good reason is that so many other places have learned to make as good or better.
Decades ago, Monty Python did a skit about "Australian Table Wines". It may have been funny then, but try a few. Places never really known for winemaking seem to be giving them a run for their money, and of course, there are still the glorious Reislings, etc., so people have more choices.
Then, perhaps in the hindbrain, there is a murmer of "Why buy from someone who hates my guts- Lets see what this stuff is like..."