We all know why Unlimited blocks are a bad idea.
A set of articles to learn why Segwit too is a terrible idea:
https://medium.com/@SegWit/segwit-resources-6b7432b42b1eThe only competitive advantage of Bitcoin is its
safe haven status, gold standard of cryptocurrency. Unlimited blocks and Segwit both will bring too much uncertainty and will remove the safe haven status from Bitcoin. Investors will run to other coins because those will offer the same level of (un)safety as Segwit/Unlimited Bitcoin, but compared to Segwit/Unlimited Bitcoin these altcoins are more advanced technologically.
Bitcoin should be left alone as a crypto reserve and crypto settlement network, as is, only bugfixes should be done on it. Do not let the only advantage that Bitcoin has be taken away with protocol upgrades of any kind, they will ensure Bitcoin's demise if they are allowed to happen. And I don't care how much testing goes into Unlimited, Segwit, whatever. This will not be the old Bitcoin, and it's bad bad bad, Bitcoin as an investment class will evaporate. Let them developers play with altcoins, there is a ****load of them to show their skills. Leave Bitcoin alone.