Scanners is part of it, but there aren't enough radiologists for even the scanners we do have today, enough urologists, enough clinic rooms, enough CNS's/navigators, histopathologists, etc.
And there's no money - some people seemed to think no screening program would get approved unless it was cost-neutral. Given how expensive it is to treat men diagnosed late versus those diagnosed early, screening and diagnosing men earlier has lots of scope to make savings, which could pay for screening. This was the basis of PCR's response to the government, if the screening covered high risk groups (Black men and men with a family history).
On scanning and pathology, there have been several trials of using AI to analyse the results, and that is probably the way things will go given we're unlikely to ever have enough radiologists and hisopathologists.