Linguist here. It really isn't. There are plenty of competing and very compelling theories in e.g. big parts of Europe. Especially Functional Grammar and its different branches. The only relation they really have to UG is that they're not it.
At my university no one in the linguistics department actually subscribed to UG or any derivatives thereof but in the English department they did. I've observed sort of the same divide in countries. In English speaking counties UG seems to be the prevailing theory while it's much less so in non-English speaking countries.
Unfortunately people are extremely religious about their preferred theory of grammar, and it's hard to have a useful discussion about it when people are unable to remove themselves from the subject and discuss it objectively.
At my university no one in the linguistics department actually subscribed to UG or any derivatives thereof but in the English department they did. I've observed sort of the same divide in countries. In English speaking counties UG seems to be the prevailing theory while it's much less so in non-English speaking countries.
Unfortunately people are extremely religious about their preferred theory of grammar, and it's hard to have a useful discussion about it when people are unable to remove themselves from the subject and discuss it objectively.