No it isn't. MCP is a security nightmare, just as bad as crypto "smart contracts".
The protocol already has been riddled with embarrassing vulnerabilities which is already a badly designed standard and would already be a disaster if it was applied all over the web.
Security consultants are having a feast on breaking these LLM apps just like they did with the crappy "smart contracts" in crypto. Adding MCP to the mix would just make it all worse.
Neither of them is "Web 3.0".