Your thread title is a little bit misleading, OP.
What do you mean by "bitcoin interest"?The interest rate paid for bitcoin loans or the number
of people interested in using and adopting bitcoin?
Bitcoin itself is not an industry (and i don`t get it,what do you mean by "earning industry",do you mean bitcoin mining?).Bitcoin is a currency and many business owners will adopt btc.
Just forgive OP for this neophyte type of a post. Maybe he is having a hard time expressing what he has in his mind which resulted into some sort of a confusing construction of a sentence. Maybe he is saying that in the future there would be many people who can be interested with Bitcoin as it is proven to be creating wealth for people who are holding the cryptocurrency. And there is no question on that, unless something catastrophic will happen on a global basis.