The PM's promise to bring back conscription isn't serious politics. It's hardly serious electioneering either.
Because
(A) He knows he's unlikely to be PM for very much longer and so is never going to be required to carry through on it.....
And
(B) He must also know (as anyone who thinks about it must know) that it would be ruinously expensive to implement and, more importantly, hugely unpopular with those on whom it impacted (meaning young adults of conscriptable age and their families) leading to social division, mass disobedience, demonstrations, riots.....
Because
(A) He knows he's unlikely to be PM for very much longer and so is never going to be required to carry through on it.....
And
(B) He must also know (as anyone who thinks about it must know) that it would be ruinously expensive to implement and, more importantly, hugely unpopular with those on whom it impacted (meaning young adults of conscriptable age and their families) leading to social division, mass disobedience, demonstrations, riots.....