With AI we need fewer programmers, and the juniors will possibly be the first to go, but they might me retrained for other careers (which might eventually get cancelled too because of AI), or out of work.
The software they produced did something - it might have been a CRM or a game, but out of work people might have to cut back on their gaming spend. As for the CRM app business, the customers and potential software customers are also cutting back in staff, and the CRM apps will be able to conduct direct B2B negotiations with client CRMs, so there's no job opportunities there, and so more people are out of work. Perhaps the businesses that used the AI-based B2B and B2C CRM and ERP systems won't be needed any more, or not have a viable customer base, too.
Other industries are replacing folks with 'AI', so the unemployment pool is getting larger. This means the luxury and non-vital goods manufacturers will have less revenue and they are laying off staff so there's some compensation there, but eventually not enough for survival - which is 'fine' because AI is replacing all this stuff.
This snowballs into other industries, leaving just those jobs that can be done more easily by a human, but those jobs will also reduce as AI and surrounding robotics etc improve, so what do all these unemployed people do all day. Some will embrace leisure activities that don't break the bank. Some may volunteer for community work or projects to improve the World, but they still need to eat and pay bills - who's going to help with that?
One solution might be a 'Star Trek' economy not based on work for reward, but that's a big cultural shift that people and governments will struggle massively to get their heads around conceptually.
There will also be powerful resistance to such a radical rebasing of the planet-wide financial model, especially by those people and organisations that have amassed wealth and don't want to give it up. They'll even fight back with lobbying and arguments against change while they're getting replaced with AI.
Junior developers require guidance but are still producing value. And with good guidance, they will do amazing work.