It is unlikely that Bitcoin will ever cost so much money, there is only one option - a very strong decline in the dollar price.
In fact the dollar have decades having a very strong decline that will continue, but.....You would have said the same when BTC was 0.009 cent.
'It is unlikely that Bitcoin could cost 15 dollars'. It went to $ 20,000 9 years later, so from 7500 to 10,000,000 is very likely in the coming years.