BitcoinUnlimited is ahead of it's time still, Ethereum is a bit further than that.
Ethereum is not 100% decentralized it is centrally controlled and that is the reason they could have fast and effortless upgrades.
If bitcoin community was not fighting and crying over which solution is better we could have SegWit+LightningNetwork long time ago.
Instead we have and will behaving scaling drama simply because 25% of miners don't care at all or wait for new solution, 30% is signalling SegWit and 35% is going after BU.