That's why i think encouraging people to hold bitcoins nowadays is really working and profitable idea
as you noticed above it's expected that the Bitcoin's price is going up in the few next years so it's time to hold it
Just explain them properly the future aheads of bitcoin technology including all good hype's and they will automatically hold coins without saying so that they must hold.
But...
..they will only just do that if only they will absorb all the thoughts about the future of bitcoin seriously while you are stating some information in their precious mind.