I think as long as patients are:
(a) getting cancer,
(b) wanting treatment for their cancer,
(c) having systemic therapy for cancer,
(d) getting side effects / are at risk for side effects from systemic therapy, and
(e) needing a discussion of risks/benefits of any therapy,
then there will always be some sort of role for oncologists.
That being said, I feel like every conversation about future technologies taking over any sort of difficult job ends up going more or less the same way:
Futurist: Do you think technology will make your job obsolete?
Person with a Difficult Job: No, because I don't think technology can do X
Futurist: OK but what if it COULD do X?
Person with a Difficult Job: Doesn't seem possible.
Futurist: Yeah, but what if it COULD?
Person with a Difficult Job: Well, I also do Y and Z...
Futurist: OK, so what if technology could do Y and Z?
and repeat until Person with Difficult Job gives up.
I can't really imagine patients in my lifetime agreeing to get some sort of toxic drug combo without having a conversation about the risks/benefits with an oncologist first, but hey, there was also apparently a time where driverless elevators seemed insane so who knows?