Why do you care so much about the bitcoin dominance level? Just because of its first-mover advantage?
If you want bitcoin dominance level back to 40-50%, another way for it to happen is the prices of altcoins crashing. When bitcoin price crashes, it will take every other cryptocurrencies down with it.
I think it is because compared to other coins, bitcoin is the battle hardened veteran. When cripto has hit the news in the last few years the one peaple talk about is bitcoin. Sure, it is no longer the greatest in terms of tech but think about the state of the market, lots of peaple are new and are only aware of the surface level.
Will this happen? No idea, but it is worth considering.
He gets into it better here:
and here
I believe that there is not enough electricity on earth for many proof of work coins.
From this basic hypothesis, Bitcoin will dominate POW coins. Coins like SYS coin are doing the smart long term thing. They merge mine with Bitcoin.
If you believe in POS model, my intuition is to go DPOS like Bitshares. This considerably reduces the power of colluding whales on the network.
The POW vs POS discussion merits a whole post on its own.