A sports dynasty is still an excellence and dominance over a long period of time. Unless the definitions of "long period of time" or "excellence and dominance" change with the rules of the games, your point is moot.
The reality is that its just a lot harder to have a sports dynasty anymore. You can't move the goal posts closer Daven. Or are you one of those guys who thinks everyone should get a trophy even if they finish last?
"Its harder to have a sports dynasty...so lets change the definition"..... I reject that.