No. Eight hours of soul-crushing boredom every day keeps people in such jobs from doing... anything they want. Like learning stuff that might help them contribute to society in other ways (in a more useful job, maybe).
> Not having a job puts you in a lower social caste
This is a stupid societal expectation that should be fought rather than supported in the way you say.
> It leaves people lots of time to think of better jobs to get.
Thinking is a useful skill if and only if the job they aspire to is philosopher. For everything else (and for philosophers as well, really) you need training, and for that you need time.
> Not having a job puts you in a lower social caste
This is a stupid societal expectation that should be fought rather than supported in the way you say.