Yep, any sort of event sourcing approach will theoretically give you the time machine this guy is looking for (albeit with the data from the "bad" release being

Yep, any sort of event sourcing approach will theoretically give you the time machine this guy is looking for (albeit with the data from the "bad" release being entirely thrown away). However in practice I think it's non-trivial to bake this into your deployments. In the process of rolling out a CQRS-based system now though so maybe we'll give it a go when time allows.