Think of it this way:
Without hard numbers to support me, I'd guess that surgery is the primary curative treatment modality in about 70-80% of tumors, radiation in 35-45% (I know it adds up to over 100%, but there is considerable overlap w/ surgery), and chemotherapy in about 10% (lymphoma, leukemia, seminoma, and little else). Of course, there is a considerable body of literature supporting combined modality treatment in many tumor sites, and this means that chemo remains important as a complementary treatment modality, but primarily for sterilization of microscopic disease, as it is inadequate (with a few exceptions) for the clearance of gross disease.
Put another way, if oncology were Van Halen, surgery would be Eddie, radiation oncology would be David Lee Roth (let's just all agree that Van Hagar and that god-awful experiment w/ the lead singer from Extreme never happened), and heme-onc would be Michael Anthony; important to the overall product, yes, but pretty much only invited into the group because he had a van, and we needed the transportation to the gigs.
We ain't going nowhere.