Astronomical time is pointless anyway
Having illogically defined time zones already makes synchronizing with astronomical time pointless. I suppose it would make a bit of sense if our time zones where split correctly so that local 'noon' was at the point where the sun was directly 'overhead'.
This whole leap seconds stuff, to me, is about as useful as moving the distance markers along the highway because the pavement expands and contracts with age. Sure moving it a few centimeters would make it more accurate, but you'd have to disrupt the flow of traffic to do it, and its such a small change that almost no one will ever notice the change itself, only the side effects.