It's too far to predict btc position in 2030. But I think there will be many things happen with BTC from now on till 2030. And I think supply will caped if BTC still survives.
Don't be negative. Bitcoin can survive until I my self cannot. Bitcoin on 2030 will have a very big change First of this is because of the influence of technology maybe on 2030 there no fiat money and we use bitcoin as a payment. The community will become bigger and BITCOIN will be more popular to other people who don't have a connection to the internet. Many changes will occur in every year of bitcoin like today and yesterday has a very big difference.
So dont think bad about bitcoin just be positive, because bitcoin in 2030 are already legalized all over the world and the price will become double. Even if how many years are counting, but bitcoin is still most valuable of all kinds of currency.