The Visual rules have to be reviewed, and some form of EFR ( Electronic Flight rules ) have to be implemented. But this is an ICAO initiative , that will , at best , takes 20 years to set up and 10 more to implement worldwide.
Let's not be too pessimistic.
A change of visual rules may be a cumbersome process, but I was rather speaking of the Boeing manual and the airline manual. ICAO is not writing the Boeing manuals. It's them at Boeing who should not put so much weight on the visual contact following a TCAS RA. It's unrealistic and if it comes to the crunch, unsafe for jet aircraft at cruising level.
Furthermore, don't be too hard on ICAO, which is an assembly of States and influence groups. I would be in favour of reinforcing the ICAO machinery and power, so that the necessary processes can be speeded up.