Yeah, I'm assuming they'll play more dates. Sparks never struck me as having enough of a national fanbase for a Coast-to-Coast headliner, but who knows?
Honestly, I live in CT (2 of the members of Sparks live in CT, so it's *kind of* a hometown show) and I've seen Sparks probably 5 or 6 times within the last year (3 of them being headline shows), and each time, their crowd gets smaller and smaller. They just don't have the draw / appeal that they before Worst Thing came out. I'd say the first headliner there was 200 (most people went for the local bands, it was an all day festival), the 2nd headliner had probably 70, and the last one with Rocky Loves Emily had probably 55 - 60 max, and a lot of people were just there for RLE and left.
Set It Off can draw, though. They might not have the biggest fan base, but their fans are devoted as all hell. I hope this tour works out though, sparks are some of the most genuine guys I've met and they deserve to be on top more than anything. The whole Fearless deal just fucked them over hard.