There is no reason to get defensive here.
So you do not believe that the protocol can last much longer than maybe a few years?
That's great but I feel that half of your arguments have nothing to do with that sentiment.
And to clarify things on the protocol level.
Bitcoin does something elegant that Lamport already proposed in 84 when talking about the consensus problem.
Cryptographically signed messages make solving the Byzantine generals problem easier because attackers can't forge the general's message
This is the basic building block for bitcoin.
Other consensus variants are better for other tasks (Like using a Total order multicast for a replicated state machine).
Sticking everything into one protocol makes absolutely no sense.
You bloat the system, the code gets messy and ultimately this can lead to major problems in the long run.
A slim protocol is a good thing in this respect. It is easier to maintain and better to understand
In my vision what stops bitcoin from going much further: a) Speed of increasing wealth concentration b) Deflationary system that prohibits price stability c) Inefficiency of mining where new resources are spend while the network doesn't gain in speed or security.
I find these properties to be core properties that are also highly flawed and beyond fixing.
To a) : Would you agree with me that in our current system as you get wealthier it becomes easier to increase that wealth even more?
You are also comparing apples to oranges. The current value increase is price discovery and not deflation. Deflation will happen once this has stabilized
b) I'm not sure what you mean here. If bitcoin finds mass adoption prices won't fluctuate as much.
Because bitcoin is deflationary the incentive to spend it is lower. It will be interesting to see how that plays out on a larger scale if
bitcoin is ever to become mainstream
c) I've told you before that Proof of Work is a robust way of building consensus in such an anonymous probabilistic consensus
Bitcoin is a protocol. If a better method comes along that is guaranteed to work it can be implemented trivially.
People need to wrap their head around the fact that bitcoin is what the majority of miners use as a protocol.
Anything can be changed, yes this includes the 21 million cap. If everyone adopts a protocol that changes this then
thats that. If some don't agree with this you'd fork bitcoin, effectively creating a new altcoin.