Every single thing on this planet changes, upgrades, whatever name it.
Thats not a true statement. The things with most value are those that stand like a stone unchanged. The most expensive chocolate would be that one, thats reciepie does not change for hundreds of years and you, your grandfather and your grandchildren would eat a chocolate that tastes exactly the same.
If bitcoin defends from both segwit and bu, that should be a really good news and will attract long term investors.