It's not a bad thing but you don't have your facts straight.
Song of ice and fire would not have sold as well as it did had not Lord of the rings been made in to films and taken the world by storm.
Before Lord of the rings fantasy wasn't a genre to be taken seriously. people used whool and nittedd and then sprayed it with silver paint wen they were to film chainamail.
Game of thrones wouldn't be if not LotR paved way and can't be named the force behind fantasy's mainstreem acceptance.
I can give them thr rivival after Eragon killed it for the genre on the screen. but I can't give it more than that.
And you ask your fellow fantasy loving firends and a lot of them will know of Discworld. it's a huge fenominon but it's a bit of an acuierd taste and doesn't tickle everyones fansy, too much satire and dry humour i guess. I really enjy and adore Game of thrones, I do. it's a great show.
I can only imadgen what Ledgend of the seeker feelt when they saw what people could do.