The show has no momentum. Those producers lost $18 million on Broadway, the tour was scrapped, and they could still be licking their wounds. I think they would be foolish to return to London 2+ years later.
And it's not like the original lead producing team had a big West End force behind it. The three entities were "Whistle Pig" (Matthew Warchus, Tim Minchin, and Danny Rubin – NEVER PUT YOUR OWN MONEY IN THE SHOW!); theatre newcomer Columbia Live Stage (owned by Sony); and The Dodgers (Jersey Boys, Matilda in New York).
Tim Minchin keeps tweeting about how he feels it's his best work, but as long as Matthew Warchus is directing the show, I have to think it would be similarly large and complicated as it was on Broadway.