Bitcoin was designed to be "electronic cash". Nothing should be changed in core that does not support this mission.
The title of the Bitcoin white paper - "Bitcoin: A Peer-to-Peer Electronic Cash System".
There are many ways to implement electronic cash, and blockchain was merely one possible way of doing it. What you are saying here is like saying an A380 airplane was design for "flight". While technically true, it misses the entire point of that enormous undertaking.
Bitcoin's central purpose was the evasion of government oversight into transactions.
If you didn't care about that purpose, then blockchain would be an enormous waste of time and resources.
Like most designs, Bitcoin's design is a
trade-off:
1. Bitcoin's central goal (see above) requires
decentralization.
2. Decentralization requires an extremely complex and costly architecture to be viable, e.g. blockchain.
3. Blockchain precludes a currency from getting anywhere near being a mainstream currency that could be used for daily transactions.
Today, the problem Bitcoin has in the popular marketplace can be summed up by the following misalignment:
1.
Millions of people now love Bitcoin because it's been a profitable investment for them.
2.
Thousands of people love Bitcoin for it's original purpose of being a means of conducting numerically-delineated transactions out of the reach of government oversight.
In other words, probably 98% of Bitcoin "users" today are simply investors in a placeholder, and they gain no value whatsoever in Bitcoin's original goal thwarting government oversight into transactions. (And Bitcoin itself has been surpassed by other technologies e.g. Monera et. al. for answering Bitcoin's original goal).
As an investment in a brand name as an end in itself, the blockchain architecture works just fine since you need relatively few direct transactions to make a marketplace work. In other words, brokers gather transactions and deal in bulk. Blockchain was never meant to do any of this, but it works just fine for this purpose because transactions can be very few and very large.
If the people maintaining the core want to follow the
actual marketplace, they would solve the problems of the 98% and not the 2%. In other words, make Bitcoin work better with brokers like Binance and CoinBase, and/or make it work better with the ETF, or something like that.