Well... I actually see some appeal in that idea.

STEEM as a fee-less transaction- and data-layer with STEEM-like SMTs on top of it, basically what steem-engine is doing but not privately owned on not an even more centralized side-chain, right on the base-layer of the steem blockchain, it might not be the worst move for the platform long term.

But we don't even have those infamous SMTs yet and this was all just a speculation about potential moves forward from there. It's not actually being planned for yet, or so they said.