I don't think that's fundamentally true. The only thing that's boosted our recruitment numbers has been conflict. Our pilot and technician numbers have high entry requirements, relatively, and long lead times in training.
I think there is a bit of both there.
In a crisis the wave of enthusiasm, if it appears, supports the recruitment of large numbers. But enthusiasm is time limited. You only have a short time to convert those enthusiastic volunteers into useful soldiers and make use of them. The most rapid turnaround is from civilian to rifleman.
Every other trade requires time to develop skills, and that includes machinegunners, patrollers, mortarmen, snipers and leaders. Along with all the Woolwich trades.
If that then the question becomes, how many rifles do you need? And for how long?
My own sense is that the tendecy is away from rifles on the front line and towards rifles in the rear for security purposes. Unfotunately that demand endures even as it is the most boring, enthusiasm-sucking part of the job which ultimately drives the enthusiasts away ... and once again you end up having to rely on the King's shilling to get you the people you need.
...
I am a fan of engaging society through an active militia. I also recognize that you can only count on a portion of the militia for a long time lor all of the militia for a short time. And in a world where energy is replacing mass, electrons replacing muscles, there is less and less demand for enthusiastic rifles.
But, there is an increasing demand to engage enthusiastic taxpayers. And I believe the militia can assist with that.