The OP (whom I generally like and often agree with, but not here, not this time) selected a 32-year span because there are 32 NFL teams. Hence, by "average," that amounts to one SB win per team over a 32-year span. Since 64 teams must play in those 32 Super Bowls, that amounts to two SB appearances per team, on average, over the course of 32 years. Since there are 32 CCGs in each conference with two teams participating in each among 16 teams per conference, that amounts to four NFC or AFC championship game appearances per team over a 32-year span. The same assumptions and process apply to division titles and playoff appearances.
When one considers the Dallas Cowboys appeared in 8 of the first 30 SBs, winning 5 of them, and have not appeared in any in the past 23 years it should not make any Cowboys fan feel comfortable or appreciative for what JJ has done (save for the sheer genius of hiring Jimmy Johnson as HC) but instead should make us all the more frustrated. I think whatever the OP hoped to accomplish here, for the most part, I think he succeeded in producing just the opposite.
Had the Cowboys, from 1995 to the present, continued the team legacy "average" of one SB appearance every 0.267 years and one SB victory every 0.167 years from SBI to SBXXX, Valley Ranch's trophy case would now house not 5 but 9 Lombardi's, and the Cowboys would not be 5-3 in SBs but 9-5, or three ahead of the dreaded Steelers and now, the Patriots.
Admittedly, that is asking a lot from any franchise (other than the Yankees), to maintain such excellence over not a decade but five, but for the first 30 years of the SB era, Cowboys fans were spoiled. Dallas fielded championship caliber teams in the mid to late 60s, throughout the 70s, in the early 80s and for a brief stretch in the 90s. It has been nearly a quarter-century long dry spell since 1995.
No, the Cowboys have not been the Lions or Browns, but they have been a huge disappointment, and far less successful than the Steelers who've won two SBs since the Cowboys last reached a conference championship game.