That's a larger group, probably by an order of magnitude, than the population that will have cleared Savage by 3.2.
The content currently designed for that group? Bismarck and Ravana Extreme. There's a chance they'll get one more trial in 3.1, but that's likely to be all they get until at least 3.2.
SE may decide that adding echo to Savage is a superior option, from a design standpoint, than creating additional content geared at that level of challenge. Especially since there's a good chance that A3S and A4S with echo will probably still be more difficult than A7N and A8N.
