There's the old saying that what Little Johnny did not learn, Big John will never be able to.
It's nice to have some top shots pick up what we've said since decades, but the remedy goes along the old lines and will not do the job.
It's the basic training and first 1500 hours that imprint the skills. No MPL, Ab Initio or similar hoax onto a 320/737 (or bigger) can compensate for a thorough basic training and build up of routine and experience on smaller, less managed and less sop-infested equipment.
As long as the initial shortcuts are maintained, any kind of synthetic training in the most sophisticated sims and any alibi manual flying with the FD on, along the magenta line will only be a band-aid.
It will be difficult to bring pilots up to required skills again. Most airlines with the aid of the industry and the regulators have bred a new kind of chief pilots, TREs and TRIs with themselves no thorough basic training and experience. This group will build a wall to the now suddenly again required skills, as it would disqualify them on the spot.
And it would cost money, the most powerful wall for improvement of safety ever invented. Nobody will be ready to fork out the required funds, no taxpayer, no airline and no passenger.
What will happen is the implementation of some lame encouragement to pilots to sharpen their skills en route, but curtailed by so many restrictions that it must remain lip service. There will be more so called "manual sim sessions" to satisfy the week reaction of regulators, but they will be so packed with unrealistic required scenarios and with so many resets, that the very small actual value is even more diluted within 10 minutes. Experienced instructors slowly die out or will be so disgusted at the T%Cs and all the restrictions, unnecessary a-c sops and other obstacles, that they no longer are willing or capable to transmit their know-how. More ex-manufacturer or ex-airline exponents will write exposés like Nelson and everyone will nod and applaud, but no one will actually be able or willing to root out the core problem.
But it's good that we all talked about it ........