Listed on top or big exchanges doesn't guarantee a coin to survive a long time. It can be delisted in those exchanges if there is a strong reason. Because SHIB is a meme coin that is relatively no real use, very possible if people aren't interested to buy it again in the future. If it has no interest anymore, its transaction or its volume will drop day after day. In this situation, top exchanges may consider removing it from the list.
You're right about that. Just because SHIBA gets listed on big exchange, doesn't mean it's going to survive for a long time. Exchanges only list coins they believe it's going to make them a lot of money in the long run (even if the coin they're listing is a "shitcoin"). I don't think SHIBA is a better investment than Dogecoin, simply because it's a token built within an existing blockchain network. On top of that, SHIBA has a huge circulating supply and the project lacks active development and innovation. Dogecoin has its own blockchain network, but it's practically the same as SHIBA. "Meme" coins are speculative instruments with no real use cases for the mainstream world.
What makes you think coins like SHIBA, DOGE, and BabyShibaInu will continue to soar all the way to the moon? Inflation is what's going to kill them in the long run. I'd advise anyone to stay away from these coins as the risk of loss is too high. They're only good as a short-term investment, but that's it. Who knows what will be of SHIBA after the hype ends? Just my opinion