Yes a lot of waiting and I know it won't be that long before proving them wrong about Bitcoin. Then I won't need to stress myself in convincing them because they will be able to see the proof.
I think it is a profitable investment if you are a specialist in doing this but many people think that unprofitable opportunities ypur and forex trading is something like gambling that can happen if you are a beginner and invest in everything you find.
You can not prove everything wrong because there will always be some people who do not believe in bitcoin and will call it a scam, ponzi scheme or bubble. That does not happen just with bitcoin, in almost all investments some people believe they are good while some people think they are scams.