This is what I love about these idiotic arguments that are akin to NihilisticNoise's - people always seem to think that if you remove all the fuckups, and leave only smart people, society will remain as the same dysfunctional entity it always has.
Why is it so hard to consider that mundane jobs like this would be abolished as an industry? 500 million smarter, better bred humans are going to generate exponentially less waste than 500 million randomly-chosen, most-likely-mediocre humans, and garbage removal would be a communal effort, as we would all know that our waste adversely affects the environment we share with trillions of other species, thus we wouldn't be stupid about it.
People would get back to basics, and retarded meaningless bureacracies wouldn't be necessary in a small, sane tribal community.
It's great though, that we have a never-ending slew of dumbfucks who will passively argue in favour of a status quo, and think that they've pulled one over on us stupid eugenicists. Smart humans don't accept a broken system that's already in place: they make it efficient and useful for everyone.
Of course, not everyone is equal, so some will be better suited to take up other trades that mean more to a community than sanitation disposal (confer above paragraphs), and instead of worrying about who will do the shitty jobs, we can worry about how to fix the decayed hulking fuckup we've made of this planet first and foremost, and realize that shitty stupid jobs won't exist in a better system.
People are great at producing endless reams of excuses why not to do something, hows about we pick up the ball and start doing something without the fucking whiners or their needless acceptance of what must be done to fix things?