We couldn't really be so sure about things in the future.
But I think we all want Bitcoin to have a strong up trend right now.
Even if it has happen before a multiple times we couldn't guarantee that it would always be the same.
I agree. But still we have to have something to keep, though it does not happen as predicted, there is always chance for it to grow on some other time. When history repeats, that give confidence to every investors to keep trust the coin that every dump there is a recovery to wait.