The people who buy in rallies and sell during bear markets and then don't believe in bitcoin anymore are clowns. If the price went to 25k in the next few months I guarantee it that the community will double maybe even quadruple in just a few days.
Of course we know that the cryptocurrency community will continue to grow as many cryptocurrencies are used. Imagine if Bitcoin really hit a new ATH this year. So it could be as you say that the BTC community will increase with the amount of interest people have in Bitcoin or cryptocurrency itself.