I also dont understand the bitcoin maximalists and thinking that we need ONE coins is just stupid. I think that in the future we will have many coins and users will not even know since every coin will be payable via interchain transactions to any other. People will choose which coin to hold according to the features the value the most.

While bitcoin maximalists are certainly strange, what I see much more are bitcoin minimalists, claiming that bitcoin is not useful anymore. But there I would disagree very much!

Bitcoin is ...
the most secure coin. It has PoW which is tested and well understood. It has massive hash power behind it. The code is permanently reviewed by hackers trying to brake it to make profit. Developers are very careful. Blocks are small so that it remains reasonably decentralised. Imagine a coin like 0x suddenly shoot up to the marketcap of bitcoin? Would anyone find a serious bug. I think that is rather likely.
it is leading innovation. Currently the smartest people are developing bitcoin. They move slow and are not trying new revolutionary ideas. But there is still a lot of innovation implemented in bitcoin. The big question is what happens to lightning network.
it has strong fundamentals and does not try to do everything. Open decentralised and secure money is a solid product. No need to add more.

What I see is bitcoin making a lot of development in a good direction. It may seem boring because of all the alternatives that make crazy claims and have revolutionary new ideas. But these are not properly tested at large stake and often nothing but empty promises. It is far to early to declare bitcoin dead. I have not seen a real alternative so far. Because just changing blocktimes/sizes is not revolutionary, neither is using PoS which currently should not be used for open money but rather for smart contracts.

When I see a great new idea, I am happy to look into it, but as of now bitcoin is still the leader because it is just as good but more mature than all of the alternatives. Right now the biggest question is lightning. If it works well and people can use it comfortably, bitcoin will certainly have a very good medium term outlook.