I think the reason why people investing in Bitcoin is to earn profit where some are afraid that they will miss the chance to earn profit. You can say that it is very much like FUD or FOMO that they also want to invest. If they really want to invest then they should have bought Bitcoin when it didn't reach the price of bitcoin today.
Its just best option for them I think,its good that they're willing to allocate more bitcoin,even before the upcoming bitcoin halving event.Also,a variety of beneficial factors can make people still want to invest in bitcoin.Cryptocurrency gains value when demand rises higher than supply.
But even at that,bitcoin stills holds something for the future.Bitcoin remains a valuable thing to hold or accumulate with significant returns in future and beyond.
I don't think ATH will really withdraw people's interest and attention from investing in it or buy bitcoin.Even with the ATH,bitcoin will still be able to attract more of its enthusiasts,and constantly create a comfortable socio-economical access to freedom to us all.