Binance is a popular exchange so every coin that's added there will experience tremendous additional to its volume. Yes, Dogecoin doesn't really need to get listed there but for other traders and investors it is going to be a big news if it ever does.
I don't think this will happen. CZ said he want to see only work product projects on binance.
If that becomes a real thing and there must be a lot of coins to be delisted from the binance platform because most of tokens on binance right now has no product. Remember about some platforms like verge,and any fork coins.