It's not possible to evaluate efficacy any faster than that. I suppose we could just let everything on the market and see what happens, but it would still take

It's not possible to evaluate efficacy any faster than that. I suppose we could just let everything on the market and see what happens, but it would still take years to accumulate efficacy data. So you'd just be left with preclinical data which isn't that useful (if it was the failure rate of oncology clinical trials wouldn't be so high)