Preferences might not be the issue here since obviously if the bitcoin usage increases more, it will act now as the usual currency like what fiat is playing a role today. Whether for investment, gambling or any things listed on the poll - all are covered in general.

Now on what way will bitcoin gets increased its usage, it really needs a serious approach, by all means, e.g involvement of big companies, big people, celebrities, sports, and government (yes).

Well, still away too long before we can bitcoin being used as a pure global currency.