I think what a lot of folks are missing - whether through ignorance or deliberate blindness - is the shifting face of Fantasy as a medium from Morrowind to Skyrim.
What is the most successful and popular advlt Fantasy series going today? George R.R. Martin's "A Song of Fire and Ice", which as much as I personally don't care for it, really is the "Lord of the Rings" of the modern era. For good or ill, Fantasy settings are being shaped and reshaped accordingly in response to Martin's success. And it's not limited to just Martin either. Robert Jordan's "Wheel of Time" is another good example of the shifting face of Fantasy, or even comparing the modern day "Riftwar" books to Feist's earlier tales.
The days of High Fantasy and warring against powerful entities that defy mortal understanding are coming to an end. They're being replaced by far more intimate and personal conflicts between individuals that feature some trapping of the wondrous.
As for Lore, I think the argument could be made much more strongly that Bethesda disregarded Lore in Oblivion then Skyrim. Oblivion saw Cyrodill changed from a Tropical Rainforest to a generic European Countryside and abandoned the Roman Empire Trappings of the Imperials in favor of generic Renfaire garb.
I think you misattribute to a single fantasy writer a change that has been far more subtle and culture-wide.
"A Song of Fire and Ice" is something I have not read personally, but which I have often heard described as something like "Tolkien without the cosmic war of Good and Evil". This is not something that a single writer has done to us - it's the changing of the cultural Zeitgeist.
Tolkien was a devout Christian who wrote fantasy in terms of a set of "heroes" who were merely pawns of a greater war between Good and Evil. His internal conflicts were about how a relatively minuscule man of faith (Frodo) could matter in such a cosmic storm much larger than himself, and his writings reflected that. I cannot say as definitively what Martin represents, having not read him myself, as I have previously said, but his inner struggles are necessarily different from the inner struggles of a man grappling with his faith.
When talking about the changing themes of the times, I could compare as well Superman to the X-Men as being products of the internal conflicts of society at their times, as well.
Superman was a personification of the New Deal - when they say he "stands for Truth, Justice, and the American Way", they mean he
stands in for those "virtues". When people think they are weak and powerless, Superman steps in to show the boundless strength of The American Way when people are willing to challenge their fear of their inability to act. In Superman, society is inherently Good, and all villains are somehow Alien Outsiders (often times literally, but that is beside the point) that try to inflict their villainy through being different from society. Normal - good. Freak - bad. The only halfway contradiction to this is in Lex Luthor, who exists as the corrupting moneyed powerbroker interests that FDR had to fight to get the New Deal through.
The X-Men originally stood in for black people during the Civil Rights era, (but eventually shifted over to Gay Rights, which it fit better, as you can't really hide being black or suddenly discover you are black the way that you could with mutantism,) and features a conflict between itself and society as a whole, whose nonacceptance of mutants is a driving force in the story, paralleled by a war within the mutant community about whether or not the mutants should force society to accept through peaceful demonstration and assertion of their inherent rights, or through force and intimidation.
These are not world-shaping declarations by writers, however, but people who were influenced by outside events just as much as their works may have influenced others who read them.