Bitcoin consumes 4,000,000,000 W of power to process four transactions per second. A single Raspberry Pi with a database can do an order of magnitude more on 5W. Think about that next time you wonder if it's a good design.
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I heard they can still scale up block size, would that not help in the long run? And why not stop bitcoin and instead of branching just replace it with a scalable program and replace everyone’s funds according to the last ledger? Why is this such a problem not fixable?
Scaling up the block size won't fix the underlying problem, because it only works to a small extent. You can't make blocks 1TB big and require everyone keep them all stored. Yes, you could fork into a different (better) design, but that's not Bitcoin any more.