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solid tyres
Rapsac recently tested Tannus tyres. At Spin London in 2015 he was still quite convinced by them, but he has since concluded that they become unsafe quite quickly (I'm pretty sure he tested them over less than 4,000k), as their profile becomes square-ish. Apparently, they're reasonably comfortable.
I can imagine that at some point they may find a wonder material that does the job better than air, but I doubt it.
The one I find particularly interesting is electronic shifting. Isn't this just something more to go wrong and be difficult to fix?
The other thought is about solid tyres. There are some that are apparently pretty good. Might these be worth considering in a few years when issues with them have been ironed out?