JBroadway said: "When I read your thread title, I thought this was going to be about fitting them into your show itinerary on your next trip to NY - lol!
Both shows are high profile musicals, and like most high profile musicals that play the non-profits Off-Broadway, they probably have Broadway somewhere on their radar, if only as a distant possibility in the backs of their minds. But it’s way too early to say whether they are actually likely to transfer. First we have to see if are actually well-received by audiences and critics."
The propsect that these two could wait to 2020-21 is plausible, but if they are well-reviewed, they could get to Broadway earlier. Sing Street aims to be the next Once, and is produced by prominent film producer Barabara Boccoli (who supervises the James Bond films!) - it could be a decent commerical bet, and thus front in the line when small productions start closing. Meanwhile, The Wrong Man is probably aiming to be the production which FINALLY gets Joshua Henry a Tony win. If this is the case, opening it in April 2020 would make more sense than waiting until 2020-21, as that season will probably be domianted by Hugh Jackman in The Music Man...