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In an interview with Rama, series writer Mark Waid has confirmed that the end is near for both books. The final story arcs will be Irredeemable #34-#37 and Incorruptible #27-#30.
On why the books are ending, here's Waid's answer:
Okay, really, truly — I'm just stretched thin right now both personally and professionally, and I live in mortal fear that I'm going to overstay my welcome on these books. Moreover, I feel that Max Damage's character arc is reaching its end in Incorruptible. And in Irredeemable, I've long known what the end of that series is, and lately, it's as if all the characters are moving into position for it whether I want them to or not. So let's go out big and grand, I say.
Source: Exclusive: Mark Waid Ends IRREDEEMABLE, INCORRUPTIBLE
Written or Contributed by: Zechs