In some sense you are right. At the last fork that had happened, a lot of people got free money and somehow many thinks that they need to buy more btc for more free money. I'm sure that there will come a time where bitcoin will go down. That is the time when people got their free money already for sure bitcoin might experience a temporary drop. That being said, I think it is better to not buy some altcoins now but go with the flow, just hodl btc stash then sell some at the right moment after fork then rebuy back in when the anticipated drop comes.