Been listening to the cast album repeatedly, and maybe someone can explain something to me:
"Wait For It" is a really frustrating song because, to me, it isn't saying anything.
It seems to be a song about Burr's inability to see a master plan in life ("And if there's a reason / I'm still alive / When so many have died..." "And if there's a reason / He seems to thrive / When so few survive...") - but he's going to FIND OUT that master plan and use it to his perfect advantage, because otherwise, you're just flying in the face of a dark, dark world that "doesn't discriminate / Between the sinners and the saints." In other words, before you make your move, you gotta know what it's for.
But the climactic line in each chorus doesn't parse. "And if there's a reason / I'm by her side / When so many have tried / Then I'm willing to wait for it..." Just saying that you're "willing to wait" for a grand reason is such a passive, bland, inactive way to end that thought, you honestly don't understand what he's talking about.
The song is curiously uncentered; the language (even throughout most of the song) is so unspecific that it seems to keep circling around a point without ever making one. Yes, "wait for it" is used as an effective leitmotif throughout the rest of the show - but in the actual character-defining song, it doesn't seem to say anything.