It sounds perfectly reasonable, if an airline cannot train it's pilots to perform a visual approach safely then they shouldn't be flying them. Some would argue if this is the case then they shouldn't be flying at all.
To ensure safety either increase piloting standards or reduce the level to which they need to perform. Obviously the first option is preferable but if not practical then restrict them to coupled ILS approaches on long runways with higher minima and leave the non precision approaches in poor weather to pilots competent to fly them.