You need a backbone of experienced military professional and infrastructure to do that ( eg : France used to have a lot of military center to host / train people. Those have been abandoned in the late 90s )
Why do you think so? Might be different in Eastern Europe, but as a Central European I think it’s quite unlikely that a direct conflict is going to happen.
Nobody in UK discourse is talking about conscription. Mind you, UK political discourse has gone increasingly off the rails with trying not to deal with corruption and incompetence of Tories.
Read [1] recently and it paints an bleaker picture than some other analyses.
https://www.russiamatters.org/analysis/whats-ahead-war-ukrai...
https://www.youtube.com/watch?v=deK98IeTjfY
It's a video essay on ammunition stockpiles on Ukraine and Russia by the youtuber Perun. It doesn't paint a rosy picture per se, but it does directly refute at least a few of the points made by the author of the RM blog you linked.
Actually, the fact that people are supposed to pretend things are OK, while everyone over there is possibly a few steps away from being drafted into war, is another sign that things have headed in the wrong direction in exactly the manner OP is suggesting.