I think anime of the decade will be interesting, i'm not sure what i could really classify as such so i'd need to really dig deep and think about it, but yeah I would imagine we could more than happily discuss that idea! The only thing is, would we count that as decade from 2000-2010? if so, i think i have a good idea for some actually in that regard. 2011-2020 maybe not so much.
2011-2020 would be interesting, but I think you'd struggle to come up with choices. Ignoring films, the only two candidates I'd personally push, even though I'm not either show's greatest fan, would be
Hunter x Hunter (2011) and
JoJo's Bizarre Adventure (2012). I think they're the two with the biggest potential to become all-time classics and both have a singular clear confident vision behind them, as well as their own style and flair. I don't think we've seen any other shows this decade that have been quite as bold and confident in their tone, vision and worldview. (That's not really a very good way of phrasing it. I have an idea of what I mean in my head, but I'm not describing it well.)
Perhaps taking this in a different direction, you could probably make a credible argument for
Attack on Titan and maybe
Love Live! being AOTD in terms of their clear widespread appeal and influence on other series and genres, but I haven't personally seen
Love Live! and in the case of
Attack on Titan parts of me thinks that in 20 years time, people will look back and wonder what all the fuss was about. Similar arguments could perhaps be made for
Sword Art Online and
ERASED, I suspect both of those will stick around in the public conscience for a while, though (like perhaps
Re:ZERO) I'm not sure people will come back to them. If it's the show that most matches the advancements and temperament of the decade then perhaps an interesting argument could be made for certain readings of
Durarara!! (though the first series was 2010, so it might not count), but I'm not sure whether most people would go for that or not.
(Sorry this is kind of off-topic.
)