I was trying to educate myself on "big picture" in theoretical linguistics, and started with often mentioned universal grammar, but found online resources very confusing. According to Wikipedia, "while the majority of linguists accept universal grammar, there have been a few linguists who do not accept the theory." This survey counters with "outsiders have instead taken the articulate envoys from the universalizing generativist camp to represent the consensus view within linguistics." Ouch. Browsing online publications and this site I got the impression that it is a hot topic of debate, and even definitions range from "whatever it turns out to be that all children bring to learning a language", to "common elements in all languages related to mental traits that may or may not be language specific", to "genetic language specific faculty that does or does not include recursive tree syntax", which seems closest to Wikipedia's "ability to learn grammar hard-wired into the brain". I am not in a position to evaluate various pro and con arguments, but I'd like to understand the overall situation.
Is there a definition of universal grammar that "majority of linguists" currently accept? Is there a (different) definition that "majority of linguists" currently reject? Was there a time in the past when "majority of linguists" accepted universal grammar in some sense?
It would be helpful if someone could provide an analogy with other sciences. For example, Wikipedia's language sounds like what might be said about evolution in biology. Is universal grammar like that? Or is it one of several competing mainstream theories, like corpuscular and wave optics in 18th century. Or something else.
Does linguistics have a "paradigm" (agreed upon framework that explains many facts and structures research), be it universal grammar or something else? Is it currently undergoing a "paradigm shift"?
The reason I am asking is because of phrases I read like "generative grammar has to change", or even stronger.