I have a few problems with this list. First, I don't know how anybody can list the Bulls over the Lakers. Bulls were 6/6 but they had nobody to challenge them in there era. There were no other real good teams IMO. Those LA teams had Boston, Philly and Houston every year.
I also agree that the teams of the 70s and 80s were a much better dynasty then those of the early 90s Cowboys.
How on earth can you not have the Yankees of the 20s (Miller Huggins crew) on this list? Between 1921 and 1928, they won the World Series or ALC 6 of the 8 years. Murders Row With Ruth, Gehrig and all the rest. Won 126 games, batted .307 as a team and crushed all comers. 1927 team is widely considered the best team in the history of baseball. Started another streak with Joe McCarthy as skipper in 1932, same cast of core players, and won the WS in 32, 36, 37, 38, 39, 41 and 43. In fact, you can really just say that the Yankees are the best bar none really. Celtics of the late 50s and 60s were great but lets face it, the Yankees between 21 and 64 (44 years) either won the American League Pennant or the World Series 29 times. To me, the players changed but the Yankees were great from 21 thru 64. They are, without question IMO, the greatest Dynasty of all time in any sport. This can not even be intelligently argued against IMO.
The Problem with these kinds of articles is that they don't reach back to credit teams who accomplished great things in past history.