This is not gambling. The technology that underpins bitcoin is real and the currency itself, while volatile, is legit as well.
Please do more research on the subject.
Ask yourself this: Given the choice: in 5 years, would you rather have 1 bitcoin, or $3500?
I don't know what will happen in 5 years. It's likely that bitcoin will grow more than its value today, yes; but
Long story short; if a company is traditional, they won't accept BTC. If they aren't, why would they use an inferior technology when better alternatives exist?
In the long term, it will be obsolete. But yes, in the short term, it might earn (or lose) lots of money to greedy investors.