Is Bangladesh looking at a brighter future?

It seems to me that the 413 in the 4th innings of the first test match was a one-off incident. Bangladesh has to score consistently. It is not a new dawn. Bangladesh occasionally was able to scare their opponents in test cricket, even Australia at their prime. But their opponents eventually prevailed. Bangladesh lacks consistency & perseverance. They always fail to dish out the finishing blow to their opponents. I wish they are able to do it on consistently.