I used to think the premise to Interstellar where humanity just abandons space flight and decides to never ever talk about space exploration again was preposterous. Yeah...

You'll just start having more and more plumbing breakdowns, with fewer qualified plumbers available, leading to longer wait times and shoddy patch jobs. We can already see this happening in the big cities. Though this is more to do with people not wanting to enter the skilled trades or do any hard work at all.