Of course they will. Who doesn't like having their investment grow without doing any shady business? But not everyone believe that it can be profitable and sometimes it's kind of hard to convince them.
yes that is a fact there is no doubt about this, to me not only in gambling but in all kind of activities when people find it profitable they start interest in it and then try to find ways how to get the benefit from it.
in most of the countries and specially in poor countries people have very limited access to computer and internet therefore people of that countries have very little idea about bitcoin, in most of the countries people still even do not know the name of bitcoin therefore they are really unaware of the usefulness of bitcoin, i think in such countries people need proper guidance about bitcoin they should be introduce to bitcoin properly and only then they can take interest in bitcoin and can become able to get benefit from it.