I honestly can't see any circumstance where having a Dad's army type situation helps in any way.
Conventional only we're not needed.
Nuclear we're all dead, and the planet mostly rendered uninhabitable.
So... what's the point? Under what circumstances would it make any difference to have a "citizen army"?
Sounds more like a thinly veiled recruitment drive to me. There was an article just this morning about the US struggling to recruit for their army. I guess stoking up a bit of fear might help with that.
Thing is we don't need a huge professional force in this day and age but if we cut it back too far that just invites trouble - better and more affordable to have a focussed professional force and the ability to surge it if necessary - as much as a deterrent as anything.
Tanking on reputation, which is increasingly what we are doing, only works so far if someone is crazy or clever enough to test it.
I think something a lot of people aren't appreciating is that the current situation is showing Russia they less and less need to play by the West's rules, have less and less to lose by staying on a war footing and have more and more chance against the West if they can out endure us and that makes for a dangerous situation, unless anything changes we are heading for the worst of the Cold War again, a security nightmare on Europe's border and likely an arms race and there is no substitute to man power in that situation, without it you look weak which encourages those against you towards action.
There is the possibility we sleep on the threat giving Russia time to rebuild to where they pose a real threat before we start responding to it. Russia has spent a lot of time and resources with intent in recent years around Europe towards the ends of being able to sabotage infrastructure (pipelines, etc.), building "secret" bases in strategic locations to facilitate military action (as have been found in Finland for example), infiltrating or attempting to get people sympathetic to them to positions of power in countries, plans for seizing key locations which they've actually practised such as the mass "tourist" visits to Gotland by members of Russian secret services (GRU, etc.). It isn't being done just for fun, it doesn't signal some imminent or inevitable military campaign against Europe but it does indicate the direction of travel in the mindset of those in power in Russia.
EDIT: People might laugh but I was involved a bit in what was essentially NATO vs Russia in Eve Online played out over several years and 1000s of players, they got far further than they should have because people were like nah they won't do X it makes no sense but then they went and did it and people were unprepared for it - even when all the signs were coming, but it made a different kind of sense to the average Russian mindset. Seen the same thing play out in the build up to the Ukraine war, seeing the same thing playing out now.