I think many sporting events/stars before have shown that dominance is actually good for any sport.
Chicago Bulls and Michael Jordan. You wanted the Knicks to beat the Bulls so badly but yet the Bulls and Michael Jordan helped popularize NBA.
Tiger Woods. When Tiger Woods was dominating, it was good for the sport of golf. Tiger Woods literally created Nike Golf and the latter folded after Tiger Woods started declining. Now golf is a declining sport in North America.
The issue is not about dominance. The issue is about popularity and marketing. Most of the money and most of the attention have stayed in China, hence no global influence.
A few months ago (or was it a year ago), Ma Long accepted a life achievement award at one of the WTT event and Ma Long spoke English for his speech and the internet went gaga over it (or rather the table tennis community went gaga over it).
It is not about dominance. It is about the lack of marketing and strategy.
Basketball is my thing you know ;-), as far as I remember, the Celtics or the Lakers have never won the finals 20 years straight, nor the Bulls, nor the Spurs with Duncan. It's a shared dominance, Even the Bulls did not win 6 rings straight, Jordan wanted to try baseball in 94 and 95.
I mean... since 1996 in Atlanta, only 1 men single titles left to South Korea in OGs + 1 XD in Tokyo left to Japan + 1 men's double in... 1988 in Seoul left to south Korea. Team events all won. You know the gold medal ratio right ...
World Cup, if you put Samsonov, Dima and Timo Boll aside, since 2004 it's 15/18 for the men's, and the women's single... well better not watch the table, we can only thank Miu Hirano in 2017.
WTTC well we all know the story.
It's not even a 60 or 80% dominance. It's over the 90% mark !
The NBA have never seen that kind of unshared dominance. Nor football, I don't even think France's men's team has won so much in handball since the 2000's. They left some big titles to Denmark, Spain and Germany.
Having the Celtics and the Lakers showing the rest of the league how it's done sure I like it, but it's impossible for them to dominate THAT way. I mean, if it was the case, the NBA would not like it at all, and they've made everything possible to let other franchises being able to win, with the lottery system at the draft for example.
The only team that has dominated that much is the women's USA team, even the men's USA team have suffered in the World Cup (the last one specially in China, beaten by Germany and Lithuania), in Tokyo France beat them by 7 in pool matches, and USA wins by 6 only in the gold medal match !
What has helped globalize basketball is the wake of Europe, sure the Dream Team in 92 was the best publicity, but in the 2000's they looked at the numbers... the NBA was not making money overseas, that's why they started doing FIBA matches between Euroleague and NBA champions, when the Real Madrid has beaten the Lakers, or Berlin the Spurs, it was in fact a victory for the NBA cos' they knew europeans would now really think they could do something in the big league, and that's what happened. All that has brought more money in the NBA with more TV rights from Europe. And now they export the NBA to France with the "Paris Games" each year: 2 teams playing 2 games of the regular season in 5 days.
Every CEO in any sport organization will tel you that, doping has been a terrible thing in cycling cos' there's always unshared dominance when it happens, ASO the company that organizes the Tour de France, Paris-Roubaix, Paris-Tours, Paris-Nice and the Fourmies Grand Prix is well aware of that, Christian Prud'Homme the ASO's CEO is not happy at all with Pogacar's unshared dominance, cos' it reminds too much of the Armstrong era.