The scoring system isn't the reason why skaters are not staying in the sport.
Is the problem that skaters "are not staying in the sport"?
Are we talking only about skaters who already made it to elite levels, or about reasons why skaters who might have stayed until elite levels in earlier eras are retiring earlier now?
There are many reasons why skaters tended to quit/retire at certain points of their careers during, let's say, the figures era (which more or less coincided with the "amateurism" era), the 1991-2003 6.0/no figures era, and the IJS era. Some of those reasons have waxed and waned within those general time periods for other reasons as well. And of course individuals always have their own individual reasons.
To list a number of such reasons, some of which have been mentioned in the article or by other posters in this thread:
money
injuries (which probably increased over time with increased athletic demands)
other more compelling activities/interests (including social life, academics, other sports, other artistic endeavors, etc.)
stereotyping of male skaters
loss of opportunity or reward for the skills they were best at/enjoyed most
recognition that they couldn't keep up with the demands of the qualifying track leading to elite competition -- for reasons of expense, physical ability, time, etc.
dislike of type of skills and training focus demanded on the qualifying track
liking to skate but not liking to compete
etc.
One thing that I do think is happening in the US is that skaters who want to remain in the sport but who don't have what it takes financially, physically, or temperamentally to succeed in elite-track competition may choose at an earlier point in their careers to focus instead on other kinds of skating opportunities.
"Turning pro" in late teens/twenties for financial or artistic reasons is less common now than in earlier eras.
Social ice dancing is less of thing in the 21st century than in the 20th.
And competitive partnered ice dance has grown somewhat in recent years, but the numbers of skaters who start out in ice dance or leave singles skating to pursue ice dance aren't high enough to make a significant difference in the total number of singles competitors.
(And the number of skaters going into pairs is even lower and usually has been over the years.)
However, a larger percentage of younger skaters are choosing early on to focus on solo dance, synchronized skating, Theatre on Ice, Showcase events, or less intense competition streams such as Excel or collegiate/high school team competitions.
So the number of skaters in the competitive singles track might be significantly lower than at earlier times while the number of active participant skaters remains approximately the same.
Meanwhile the total number of singles skaters who are actually landing double axels and triples is probably higher than ever, as the expectations of what it takes to fit into the competitive stream continue to rise
But if international success now requires more than just triple jumps, maybe the question is how can the US develop skaters who can do those quads, triple axels, multiple triple-triple combos, level 4 spins and steps, and the kind of skating skills and presentation skills that the IJS currently rewards . . . and also appeal to American audiences.
But the answers about appealing to audiences are probably different depending on whether the target audience includes those who first became interested in the sport 20+ years ago vs. developing newer audiences.
Either way, international rules rewarding and shaping how the technical side of the sport develops can't be driven by what a subset of one country's audiences might prefer in terms of entertainment value. At best, that could be one consideration among many. Or several separate considerations, given the different potential audience segments that could be targeted within the US as well as elsewhere.