Do you agree that that's a "command and control" approach to the market for research labor? In other words, it sounds like you want to have the government set the number of researchers in the field rather than simply pay for the amount of research it wants, in the same way some governments (the USSR is the classical example) in the past have decided on the number of manufacturers in a certain industry, not just how much they want to pay for a certain widget.
All things being equal, such approaches are generally discouraged by economists. So presumably you think that the market for research labor is unusual, e.g. has some market failure. Could you describe what you think that is?
Basically, my angle is that, once you've answered this question, it's almost always better to try to fix the market failure directly rather than go full command and control. For instance, if you think that prospective PhD students aren't well informed about the long odds against getting a tenured position, then it would be better to educate those students rather than instituting a cap on the number of PhDs that are funded.
All things being equal, such approaches are generally discouraged by economists. So presumably you think that the market for research labor is unusual, e.g. has some market failure. Could you describe what you think that is?
Basically, my angle is that, once you've answered this question, it's almost always better to try to fix the market failure directly rather than go full command and control. For instance, if you think that prospective PhD students aren't well informed about the long odds against getting a tenured position, then it would be better to educate those students rather than instituting a cap on the number of PhDs that are funded.