Will the BTC price take longer to reach all time highs with time? 5 years ago 10k bought 3 BTC, now it buys .25. Does that mean that as price goes up, it will require more fiat to keep it pumping? When price is 200k, it will take a lot of money to influence price it seems. Even with mass adoption, it would require people to put it a ton of money to raise the price.
I clearly understand where you are coming from, and funny enough the price will keep increasing. Years ago it wasn't worth what it is worth today, and many people might have asked this questions you are asking now, question of it will become more costly, and few years from now, many will still question its high price, to me it shows that, irrespective of what most people might think of Bitcoin, Bitcoin has come to stay and will only keep getting more valuable.
Also, the simple reason why Bitcoin price will keep growing is not a matter of fiat, but a matter of more people holding and not selling, which drives a bit of scarcity thus leading to more buying, and price also drops when more people are selling.
Lastly, about All Time High, we can't really fathom when it will happen again, but if more confidence returns to the market which will see more people buying, then another All Time High will be realized.