If Macron does win, which he most likely will outside of a nightmare scenario, then I think that's setting up an even bigger disaster down the line. When you boil it down, he's really a continuation of Hollande's neoliberal policies, and his main selling point is this cultural liberalism that I think can only get people excited for so long.
Base point, people don't like neoliberal economics. And if Macron is really going to tear down the labor unions and govern as a pro-business centrist, I have no doubt there's going to be another Le Pen that comes down the line who's able to better sell right-wing populism to people, and outright win.