I don't see this happening for a few reasons.
Steem and Tron are VERY different. It's a big question mark whether or not you even COULD make a Steem equivalent on Tron, as I mentioned, Tron has transaction fees, that alone makes it hard to conceive how this would work and I'm sure there's a ton of other technical hurdles.
Justin Sun has already walked these comments back. Honestly Justins power is that he is a hype man, I think he said what he thought would get people excited genuinely thinking people here would be excited by that news, once he saw the opposite he walked it back. I'd bet there is no real plan in place and he just said something.
Do you actually think the Steemit team wants that? Do you think they would all just abandon this thing they've poured their heart and soul into for years? I don't think so.