1. Trump can't find people he wants for the jobs. This would be less about not finding competent people than because Trump's first (and maybe only) priority is that they be personally loyal to him. I think that's a serious issue--he's not a king, after all. But Trump literally DIDN'T KNOW that he had to hire 4-5K people into key political positions in the government. He's never been in charge of such a large organization. His multimillion-dollar business doesn't have 100 employees. Finding 4-5K people who will walk through fire for him will be tough.
2. Trump's refusal to hire people to run the government is BY DESIGN--that is, if no one is in charge, the government won't...work...eventually. This is much more insidious but it's not an impossible scenario. He's hired someone to run the EPA who doesn't mostly believe in the EPA's mission. His first choice for Labor Secretary was materially opposed to the interests of labor. His Secretary of Education's vision is pretty much a dismantling of public education.
One thing is for sure--if your ultimate goal is to see the system of US law enforcement break down, not hiring any US attorneys would be a sensible strategy.