I was talking about the English Premier League. Hence the "No way would I like rugby to emulate this".
But in regards to teams coming and going and established reigns:
If you think reigns start and end due to any other reason than money, then you're wrong.
There's a clear disparity in general in the league, between teams paying near/up to the cap: Tigers, Saints, Sarries, Glos, Bath, perhaps Exe, and teams that are clearly not: Wasps, Sale, Wuss, Falcons, Irish.
Wasps used to be near the top because they spent a lot of money to keep up at the top. They've run themselves into millions of debt and have come close to administration and relegation as a result. It wasn't a healthy business practise to follow.
Sarries joined the top 4 purely because they started having the money to invest in the team.
Glos did really well for years and then started hitting mid-table because they didn't have the benefactors to keep up with the money being spent by the top teams when the salary cap was doubled and the recession hit. It was only last year when Glos started paying up to the salary cap again, simply through economic recovery and growth of the club. Expect results to start materialising when Davies has had the chance to put his foot down on the whole squad and get rid of some dead wood.
Same with Bath. They are competing now because they finally had a chance to get rid of a lot of dead wood. But ultimately, they wouldn't be anywhere near if they couldn't pay up to the cap.
Are you really under an impression that Irish and Wuss can get to the top of the table, when they don't have the money to tie their players down? And that their lack of success will give them any chance of growing their crowds, or setting up a regular position in the lucrative European market? There's only one way for them really: spend more. And they cannot do that without benefactors.
There are still a few clubs in the Premiership that can challenge without wealthy benefactors. But I'm not sure how long this will last. Aggressive plans to increase the salary cap will make these teams fall behind and make the league into a three-tier one.
Everything revolves around money in the Premiership...
It's not top 4 vs. the rest yet, but it's heading that way.