There is no question that they will, despite what the detractors say. This has clearly been the Klitschko era in HW boxing.
There's quite a difference between reigning in an era and a "dynasty". It's not an appropriate term to describe a championship reign, even if you had a relation who was, on and off, holding a version of the title in the same division. And, it's not like one brother handed over to the other, either. So - no - not a dynasty.
Not sure this needed to be moved from classic to general.. One of the Klits has been retired for years while the other has been around since jesus was a baby and approaching the end of his career... But it is what it is.