Could Eragon work as an animated series?

So? She-ra's only cartoon was in 1985 and Netflix still snatched her up based on that and the odd toyline. They also made a Castlevania show despite video game adaptations almost always being really shit.
Mid 2000's fantasy novels are an untapped goldmine for streaming adaptations.

If you were 14 in 2007 you're the prime consooming demographics today, and most people not reading the later books is probably a good thing.
They wouldn't get anywhere near the later books anyway, probably follow the general plot up until his brother and the rival guy who's names I can't remember are introduced, which would take 2-3 seasons then wrap it up with a mostly original ending in season 4 as the attention dies down.

80s nostalgia is huge right now, 2000s nostagia still needs another decade or two. Or never because the 2000s fuckin sucked.