I can't imagine it coming back now, unfortunatly. They were shown, didn't do too well, so they were taken off. I can't see why they'd think about bringing them back again. It's a shame, as I've said, I do think that a better timeslot and more promotion would have helped. Watching The Vault I see a trailer for AnimeCentral around once an hour, if the Classic Chart Shows had been promoted a similar way, across all the CSC Channels, it would have got much more attention than it did. Instead, they had infrequent trailers, limited to The Vault, and the episodes were on during times that much of the target audience wouldn't have been watching. I do think one thing they could try would be to have a "Chart Show Weekend", even if it did only consist of the episodes they've already shown it would get a lot more attention than the repeats did before.
One thing I've said before is that if I came into a large amount of money, such as winning the lottery, I'd fund the repeats myself and pay for the older tapes to be converted, even if they were shoved in some out of the way early morning timeslot. Short of the very unlikelyhood of that hapenning, I'm afraid we probably won't see the repeats again.
On a slightly connected note, I noticed a couple of weeks back, The Vault were showing some bits that the Spice Girls had recorded for the 1996 Special, where they picked their videos of the year, both the individual choices, and the whole group's. A few months back they did similar by showing footage Mark Owen and Gary Barlow had done for the show. They'll probably dig these bits out every now and then, even if they don't show the episodes themselves.
