There's a huge difference between cleaning up the surrounding landscape and dealing with the broken reactors themselves. Eventually we'll figure out how to fix those. Nothing an X-Prize contest or two can't help address if things get truly desperate.
I'd take a contaminated room any day over a whole planet slowly cooking itself to death.
We have a number of commercial space-flight companies now and a dozen self-driving car platforms that work quite well. Neither of these really existed before their respective X-Prize type challenges.
Seriously? "Expensive but not impossible"?