And the idea for decentralize trading platform, i like that. And i think there allready some exchange do that but not a big exchange.
edit: Found some article who talk about decentralize trading platform here https://coinsutra.com/best-decentralized-exchanges-dex/
Yeah. Unfortunately, people are more driven to make money rather than actually supporting a cryptocurrency for its own good. They don't think about that specific coin's security, or level of decentralization, but just to fill their own pockets in the long term. However, a perfect cryptocurrency would be such capable of implementing specific features that would guarantee its decentralization over the long term.
Personally, I've seen Ravencoin as an ideal model of a decentralized cryptocurrency. As it's being traded at a decentralized exchange, and it incorporates an ASIC-resistant mining algorithm, it could remain resilient and resistant against attacks for quite a long time. In the future, I'm planning to create the most decentralized cryptocurrency possible by learning of the issues inherent within Bitcoin and most altcoins, preventing such issues from occurring on the new coin as much as possible. Mining centralization is a huge issue these days in most PoW coins like Bitcoin, and if nothing's done about it, serious consequences could be seen in the future.
Therefore, if taken into the right direction, cryptocurrencies could be traded only on decentralized exchanges and mined with CPUs or GPUs to eliminate the middleman as much as possible, and reduce central control by any malicious actor.