Are these hypothetical situations or problems you have highlighted in Bitcoin? If it's the latter, let me argue some of them;
This is true for most but it is still being used as a currency. When you factor in the number of years since it went life we are still right on track in terms of adoption.
Bitcoin is slower and more expensive to transact than ever before. I think it's very safe to assume that Bitcoin will never be used as a mainstream currency as long as it uses the blockchain architecture in the backend.
False. This was never the original purpose of Bitcoin and it was never private either. Chain analysis is just a fancy word for reading an already public chain and drawing connections base of previous transactions.
I find this rather bizarre, and I didn't think what I had said was particularly controversial. Bitcoin was invented in the context of P2P networks, which are only necessary when you don't want governments able to observe or stop the transactions. Otherwise there is no reason to just use a central server, which is the way almost all of the internet works already. The p2p approach is slower, more expensive, more complicated, harder to use, and can easily be very dangerous for end-users. The only reason you resort to something like that is because
you have to, e.g. you could be prosecuted if you don't.
The world is not in need of a fast and cheap means of transacting, they already have a variety of option, Bitcoin will not still finish top if it becomes centralized.
This reminds of me of a famous quote: "640k ought to be enough for anybody"

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Credit card transactions are still pretty slow in computing terms, and are still pretty expensive. But more importantly, they require an exchange of personal information in the transaction, which is a major limitation.
An even more volatile means of paying for a cup of coffee?
Touché

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But if transactions are fast and cheap enough, you can presumably have processes inside of your wallet to move your store of value to thing(s) that are more stable. Then you could only expose yourself to Bitcoin's volatility when that's what you wanted.
In essence it will become just like any of the thousand other worthless altcoins.
Maybe. Or maybe Bitcoin being used by 100x more people in the world will make the price go way up. Who knows.