There are several flaws in your reasoning:
When a company pays dividends is because they unable to provide growth. I personally avoid any dividend paying shares. Tesla, Amazon, Google or Apple don't pay dividends because they are confident they can increase their market share and provide real value to investors. Only legacy brands and utilities pay dividends.
When you invest in a proper company you get 10 or 20x over the years. Bitcoin is in that league. Dividens are for losers.
There are many bitcoin killers and also ether killers, most of them are already dead. Bitcoin has teh network, the niche and the first mover advantage. It's imposible to take that away even if a better technology comes along.
Besides, bitcoin has the scarcity in its favor which many altcoins don't.
Ethereum has a great future but not as a stroe of value so it's not competing directly with BTC.
Gold is very expensive to secure, custody, verufy, transport, and transfer. Plus most people own paper gold that gets rehypothecated 100x1. Bitcoin is like gold minus the flaws, hence its value.
The price of bitcoin is due to suplly and demand, same for gold, real estate or stocks. Everything is "atificially inflated". If everyone decides to sell their gold, it'll drop to zero overnight.
Have you heard of the lighting network? It's bitcoin secon layer solution. They've been using it in El Salvador and other places for years. It can handle billions of transactions per second and its virtually free. Compare that to sending money abroad through your bank. It takes 5 days and they charge whatever they want.
Miners will keep mining until 2140 and then will kepp active by confirming transactions and earning fees.
Bitcoin has the brand, the network, the miners, the nodes and the investors. No one is going to buy shitcoins when they can buy the real thing. Not even Elon Musk. He keeps pumping the dog but he's got 1.4 billion in BTC. I rest my case.
Taleb is just a contrarian and an attention seeker. He's written many books talking about antifragility, skin in the game, decentralization and systemic risks. In his books he recomends investing in bitcoin as a hedge against other fragile things like banks. Now he's bored and has decided to make a few more enemies. I like his books but not the guy.