It isn't SO popular atm I supose. Older people have no clue what bitcoin is. I do think it would stay as "popular" as you think it is now though. I really can't give any reasons for this but it's just a feeling :-)
For me, Yes. Bitcoin will still be popular even if it has stable price. Well, even if the price is stable it will still be high. Bitcoin wil always be popular no matter what.