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Solid tyres have been around years and never been any good - heavy and slow.
Indeed, Physics says the last place you want extra weight on a wheel is at the radius. 200g extra in the hub (e.g. a dynohub) is barely noticeable. Stick that 200g in the tyres and it'll feel horribly sluggish.
Tubeless seems like the best compromise of the two extremes.
On Di2...
It definitely removes hand fatigue which I have had riding/racing cabled bikes during 24hrs or audax.
There's another way of reducing that hand fatigue (but it does add a lot to leg fatigue, especially in hilly terrain).
But I wonder if the auto-shift stuff will be production enough for someone to try it TCR#5 next year. Certainly looks interesting.
Greenbank-
Still not convinced by tubeless.
Fixed for that parcours would've been stupid. I'm sure someone will do it but they won't be competitive. I was barely able to turn 34x32 over the Giau after hammering the southern detour. I'd at least want a flip flop hub and then you may as well use gears. Di2 ftw!
Auto-shift system for me would be "put in granny ring, leave it there for three days".
hippy
Di2 is solid. It's Shimano. I will probably never go back to cabled bikes.
Solid tyres have been around years and never been any good - heavy and slow.