Will Tony Iommi's Cancer Derail New Black Sabbath Music?

For anyone who is not aware, Tony Iommi has been diagnosed with cancer (lymphoma). It sounds like it was caught early, and the members of Black Sabbath are saying that it's given them a real kick in the pants to work on a new album, but I'm sure worried.
Having just lost Ronnie James Dio to cancer, it would be devastating to lose Tony as well, especially on the cusp of a reunion with Ozzy Osbourne that will include new music. According to Metal Hammer, Iommi has written two new songs just since his cancer diagnosis.
Here is Black Sabbath with Ian Gillan doing "Trashed."
Will you see Black Sabbath's reunion tour this summer?