For example, people saying that DGB will hit 1$ at 8billion market cap
This is only my opinion and it can be wrong 😀 , in crypto currency marketcap is not first things which can affect future price because any pump and dump schemes, so it's not make a natural growth. Here is some reason which can affect future price
1. Real Development
2. Community
3. Massive adoption
4. Inflation control
Let say Doge coin, doge coin also good coin and they have
1. Real Development
2. Huge community
3. massive adoption from online shop
4. But this coin not control their inflation (IMO), so as you know even doge marketcap is so big but doge but nowadays doge can not hit $1
If you see market cap, there are many coin which have market cap that DGB or doge, but they have price $1 per coin
Example
Nubits -> MarketCap $200,904 Price $1.02
Biteur -> MarketCap $119,132 Price $1.13
I hope you understand my explanation