I think the altcoins have to be at least a 5-6 year to become popular. Bitcoin currently owns more than half the market. And all the altcoins don't even have that half the market. Therefore, the popularity of Bitcoin should be reduced first. And I don't think this will happen anytime soon.
I do not join with the ICOs because of the continued decline in the market. Because most ICOs are not successfully ending in this times. And tokens are trading on exchanges lower than ICO prices. But when the market start rise again, I will join the ICOs again. Because if you join the ICO of a good project, you can get a high profit in a short time.
Yes I'm sometimes buying tokens without top 100. I only get these tokens with part of my money. Already, the prices of these tokens are very low. So I can buy too much token with a small amount. But we need to know the buy this tokens can be more risky. But sometimes we can more profits when the buy this tokens.
No, I don't think we should leave the market. On the contrary, I think the market is in a pretty good position for investment. For the investment I divide my money. I buying a coins which are top 20 with the part of my money. It's safer to invest in coins in the top 20, but I think the profit rate is less. That's why I'm buying new coins with the other part of my money. Because I think I can make more profit from the new coins however can ben more risky.
Maybe in the future, Cardano could replace Ethereum. But for now it is very difficult to have such a situation. Yes, Ethereum has falled considerably over the last two months. But Ethereum is still in front of Cardano. That's why Cardano needs to continue to strengthen.