The way I understood it, the next cycle wont use the Crucible, since it is said that it was already built, but it didn't work. As I see it, Liara's time capsule contains this cycle's entire knowledge of the war with the Reapers, how to build Thanix Cannons, what tactics to use, how and when to fight them, when to avoid it, etc.. So, with the knowledge of their strengths and weaknesses, the next cycle is armed and fully prepared to combat them. I like to imagine that the next time the Reapers show up, they're met with welcoming committee like the one that awaited Sonny Corleone at Long Island toll booth in The Godfather.