I agree with your opinion that Ethereum is the top altcoin after Bitcoin. Many people have become billionaires by keeping a lot of Ethereum in their wallets. I am very sure that Ethereum in the future will create new surprises for long-term investors and Ethereum also has full trust in terms of the safest and most comfortable crypto investment.
The history of Ethereum has confirmed it in the market as a potential altcoin that has capacity to make investors to enjoy passive income, because after Bitcoin population, the next is Ethereum population because is the king among other altcoins. When you purchase huge amount of Ethereum and hold for long term before you can trade in the market, it can make you a millionaire because there are many investors that made millions or billions from Ethereum investment in the past. No doubt about Ethereum in the future, because the price will going to reach $10,000 in five years to come and it will allow investors to make passive income that will make them to continue to value Ethereum among others altcoins in the market.