@Aussie Willy A lot of it is less that they don't have a shot at worlds generally (eg. they don't have a chance this year, but they can work for it as a team in future seasons), and more that USFS doesn't give them a shot period. Teams Elite was a very strong Senior team - could've made the Worlds team based on how their international scores stacked up - but USFS made sure they knew they were low on the domestic judging pecking order. So they didn't go to worlds. Why spend the Senior time/money if you're treated unfairly? Skyliners stuck it out, but it took a several seasons for them to get the benefit of the doubt over Miami/Crystallettes - and even then, in seasons where they should've/were beating Hayden internationally, they were always clearly 2nd fiddle in the eyes of USFS.
Something I forgot to add is this: USFS is making Junior and Senior harder to participate in than ever.
It used to be you do your local comp(s), sectionals (if you didn't get an international), Junior World Qualifier (if you thought you had a shot at Junior Worlds), and Nationals. That's 3-5 competitions a season to pay to travel to - assuming $500-1k for out of town flight/hotel/bus, that's maybe $3-5k/season for travel. Now there's a series of specific monitoring competitions domestically - upping the amount of competitions teams need to attend to more like 5-10/season. That's easily closer to $5-10k in travel costs.
And these competitions are not cheap or easy to travel to - due to the rule changes there are 0 Senior/Junior teams on the West Coast (down from 1-3 of each). And yet, despite a midwest/east competition a similar weekend in fall, they expect all Junior and Senior teams to travel all the way to California for the first monitoring competition. On social media I noticed some Junior teams last season were competing just about every other week from November to March. They may have 2-3 weeks for international travel to assignments (sometimes in a 2 week block, sometimes separate). A lot of Junior/Senior skaters are high school and college students. That's a lot of school for them to miss.