i think it depends on what happens in the next 2-3 years and beyond
if stidham is the new guy and he produces and we win a SB this year or next year then its a continuation of a dynasty
if stidham takes 5 years to win a sb or his replacement is the one who wins it 5+ years from now, it will probably be a new dynasty
so i'd say it comes down to this: is there a dip in production? if no dip, same dynasty, if there's a dip then there's an obvious breaking point so multiple dynasties