Not at all, because we will always have to endure the costs of having a crappy time zone based time system, especially when we start moving into space, those time systems become absurdly antiquated.
The idea of changing time to match the sun is just completely obsolete. If every country just agreed to use UTC, besides some errant systems not easily recognized as depending on time zone based timekeeping, we could probably all be "over" the switch in a week, just like it takes a week for DST clock switchers to adjust to an hourly time change. I would propose that changing by more than an hour for various parts of the world won't have a larger effect than changing hours twice a year for DST, because the adjustment effect isn't because of the severity of the time change but because the change happened at all.
I appreciate your optimism. You do know not everyone in the world is interested in, let alone willing to make such changes? I'd guess less than 1% would be. The cost would be in the hundreds of billions.
Meanwhile, try getting just the US to switch to the metric system....
As far as space goes, interstellar time is probably rather different than Earth based time. I suspect there will be a new system based loosely off of GMT. But that won't matter to most humans for at least 20 years, more likely 100.
We already pay billions to switch DST. We pay billions annually in wasted time converting time zones.
We also waste money on the Imperial Units, but that (like the UTC proposition) is short term pains for long term benefits, and nobody likes to think long term.
You over-estimate people's appetite for change. Dropping DST is feasible and I agree with it. Converting to global UTC - not going to happen unless there is a compelling reason for your average folks, 99% of whom need to consider time zones a few times a year.
Besides, personally I think it would be much more difficult to deal with global UTC for most human activities and scheduling. It doesn't actually solve any problem. It makes some things easier and some things harder. Perhaps there would be a net benefit for some, but negative for others.
I think learning to include time zones in emails to people in different time zones might be an easier solution.