The books concluded fairly well after Jordan passed, as others have noted, thanks not only to Sanderson, but in large part to Jordan's extensive notes and his wife's guidance, so I would encourage you to finish them. As for the series, I take it as a good sign that season 2 has already been green-lit. It is such a sprawling narrative, both in terms of characters and geography, it will be interesting to see what the series chooses to focus on vs. exclude and how closely a condensed narrative will adhere to the letter and spirit of the books. Not a new challenge obviously, as GOT most likely had the same issue, but I suspect one that will weigh heavily into determining how successful the show is, along with how they visualize the more fantastical elements. Not sure if this show, at least its first season, will have full access to bottomless Bezos pockets to fund heavy CGI.
Along the lines of high-style fantasy animation at Amazon, albeit with a more comedic bent than WOT: Amazon has partnered with Critical Role, a web-streamed live Dungeons and Dragons fantasy adventure show put on by a cast of voice actors, to produce two twelve-episode seasons of the Legend of Vox Machina, an animated series based on the first campaign of Critical Role (115 3-4 hour episodes, plus additional play before they began streaming their games). The release was pushed back significantly due to COVID, but there will be a sneak peak of the series at NYC Comic Con next month and most likely a release announcement, probably targeting the end of 2021 or early 2022. The show will be aimed at an adult audience despite its animated presentation.
I have listened in podcast form to both complete campaigns of Critical Role (they started streaming campaign 1 in 2017, campaign 2 concluded at the beginning of this past summer, and season 3 will likely start up at the end of this year or beginning of next), and can recommend the show if high-fantasy comedy/adventure interests you. The cast is excited about the animated series and the behind the scenes videos look promising, so hopefully the show fulfills its promise. Critical Role's youtube channel and website have more info about the forthcoming animated series specifically and Critical Role's content more generally.