The pace of technological change makes predicting a viable but exciting future pretty much impossible. Back in 1960s to 80s the futurism of scifi was lots of computers, screens, automation, etc. You could make something look beliveable but far off by applying the cutting edge of tech that people knew about but didn't really have access to and making it look commonplace.
Today the cutting edge of tech looks pretty mundane. It's usually software, which doesn't really translate to looking futuristic. If TV show makers go too far it looks like magic and stops being an achievable dream.
Essentially, the reason why making high quality "dreams of the future" hopeful TV shows doesn't happen any more is because hardware innovation stopped looking exciting. The brilliant thing is that happened because we actually have the hardware now, and that had taught us to be realistic about the (near term) future.
Today the cutting edge of tech looks pretty mundane. It's usually software, which doesn't really translate to looking futuristic. If TV show makers go too far it looks like magic and stops being an achievable dream.
Essentially, the reason why making high quality "dreams of the future" hopeful TV shows doesn't happen any more is because hardware innovation stopped looking exciting. The brilliant thing is that happened because we actually have the hardware now, and that had taught us to be realistic about the (near term) future.