Because mining will soon be over and what will remain?
Mining will not be over, who said such a preposterous thing?

But it's very likely that it will be more and more centralized like in Bitcoin.
As I said in my edit , the miners will soon receive a reward that is less and less in % compared to the total supply.
Meaning that the impact of mining on the coin price will be minimal.
What will happen then? A price rise? Why? Because the coins are harder to get?
There are a lot of examples who said this is not the case. What will doge build upon ?
Usage and community of course. That's why I'm seeing this as a pump and something temporary and I'm no inclined to buy more but neither to sell.