At one point I think someone said we were planning on bringing back shirt orders again, but I can't recall who or when they said it...
But yeah, I'd buy another shirt, or maybe a hoodie if we do the same thing as last time with Teespring. AFAIK there shouldn't be any issues creating a new one, Teespring just charges a flat fee that's taken out of each item sale, so if we wanted to do it again it'd be super easy.
Suppose it'd be up to @Costello
to decide really.