Yeah, I understand that financially, a Stormlight Archive would be difficult, particularly for a television series. However, I wouldn't underestimate the spending power of television studios, particularly if rising budgets and revenue continue. Realistically, a SA series wouldn't get off the ground for possibly another decade until the show writers have more source material to draw upon and Sanderson can avoid the possibility of the show taking over the books, as is looking likely with a Game of Thrones and GRRM's novels. Over the next decade, I would expect television budgets to rise. Again we go back to Game of Thrones, but it's the most salient contemporary comparison to make right now, and its budget is continuously rising every year. So there's no reason why the average television budget wouldn't be increased over the next several years.
However, I agree that the world of Roshar would be difficult to adapt on-screen without extensive use of CGI. There are slight changes that could be made. Spren would be difficult to portray with so much detail, but maybe the show could rein in their use slightly, without having too big an impact on the grand story, and make them less detailed, with the obvious exception of more prominent spren such as Syl and Pattern. I don't think Shardplate and Shardblades would necessarily be overly-expensive, yet this, allied with stuff likes Highstorms, would lead to a very CGI-reliant production.
As for an earlier opinion of actors unable to portray the characters accurately, I think you might be underestimating the high standard of acting these days, particularly in television, if you don't think an actor could make Shallan, Kaladin, Dalinar etc convincing on-screen. They're great, complex characters, sure, but I don't think they're beyond an actor's abilities. As for flashbacks, structurally-speaking, maybe have them as part of a cold opening and then roll opening theme song, episode and then end credits.
As for anime, I think it's realistically the preferred option right now, but as a few posters have highlighted, I would prefer SA to be adapted in a live-action, big-budget television series which, hypothetically and looking at the increasing costs of a contemporary television series, could be a realistic probability in the next several years.