"Turing complete" is nonsense. Z-cash has a trusted supply in order to achieve privacy. Risking the most important characteristic is not a good tradeoff. Sounds like you need to stop huffing the shitcoin propaganda.

If you haven't noticed, changing Bitcoin is both risky & difficult. I would prefer that people build economically sustainable external solutions. 15 supernodes is functionally far more secure than most alts. Even some of the largest shitcoins are extremely centralized despite infinite noise about "defi" or whatever.