The higher BTC goes, the more people will get awareness of crypto currency. Just 3 years ago when BTC touched $19000, i saw more people getting interested in investing. I dont see people losing interest in investing in crypto when BTC increases with time.
Not losing interest, it's just low new buyers. The only thing that make btc have low new buyers when the price high is, people always thinking it's too late to enter the market. They always thinking the price is too high and waiting for dropping price. It's normal.
If they open their minds about bitcoin's investment, they will not think about it too late to invest in bitcoin because they still have time to start buying bitcoin. If they know that they can buy fractions by a fraction of bitcoin, they will try to use the money they do not use for anything, and they will hold it after they finish buying bitcoin.
Waiting for the dropping of the price will always recommend for people who want to buy bitcoin because that can reduce their risk from fluctuating the bitcoin price. Perhaps, they need to learn more about the bitcoin investment side before buying bitcoin.