> isn’t Macron and his coalition supremely unpopular and just one election away from losing the country to factions that have a distinctly different vision of Europe and France’s role within

That's been just as true of all their politicians for as long as I can remember. Multiparty system, after a few rounds the vote for president comes down to someone sane but unpopular vs. some equivalent of the Tea Party, the French population put clothespegs on their noses and votes for the sane option.

(Dunno about the rest of their electoral system besides president).