Yes, an interesting read, but......its too late. All the people with the multi-disiplined knowledge have gone or retired. It will take 10 years minimum to rebuild that, and by then Andrew Haines will be gone himself and the 'focus' will be lost again.
This is a far wider issue than just on the railways. During my working life I have seen a series of jobs / professions move from general purpose practitioners to specialists.
I originally qualified as an accountant. In my training I did accountancy, audit, personal tax and corporate tax. Now people are specialists before they start. I was in at the beginning of IT and have done systems analysis, programming, server management, security, networking, business process, infrastructure design and management. Very few people do this range today.
Other users of the forum will have seen similar changes in their working lives.