many projects are being developed for decentralization, one day a developer will shout eureka for all of us who dreamed about it.
In my opinion, centralized exchanges/platforms should exist but shouldn't be promoted too much or above decentralized platforms for the sake of decentralization and security of cryptocurrency. The crypto communities should be promoting the decentralized platforms. The outside world could choose to promote what they want.
I think any cryptocurrency that has most of its value on centralized platforms shouldn't be seen as very decentralized.. Most of tradings should be happening peer-to-peer or via decentralized platforms. The point is to keep things censorship resistant, immutable, secure, trustless etc. Centralized usage of cryptos shouldn't be more than 40%...the less the better.
if eventually the decentralize platform will have a volume it needs to be make all wanna go there then it will be patronized more than the ones with riskier centralize platform. once the solution comes we shall see a massive migration there. blocknet seem to be promising a real decentralization than the ones we knew today.