Following Moore's law, we're still ten years off. You can still put humongous amounts of stuff on a chip. You have more reliability with one chip, but as you put more and more stuff on it, there's always the problem of testing. It's very complicated to test, and people spend a lot of time doing it. In fact, I'd say that most of the people who graduate from here and go into hardware will be testing.
Companies have armies of people testing chips.
And this system will be easier to program than current supercomputers.