Ahhh, I'm not sure I agree with you here. As far as "the left" (in the more generic sense) goes, nobody has an exclusive claim to speaking on behalf of "the left." There's always going to be considerable differences between "liberals" and "the left." So, what Vox represents -- incremental change rather than revolutionary change, reconciling the interests of "the people" with those of big business", technocratic governance -- isn't going away altogether. One side may be stronger than the other, a new consensus may emerge where the lowest common denominator views shift away from social issues (as is the case now) to economics, but I'd insist that neoliberals aren't going anywhere.
Also, I'm not sure I agree that, for example, Alexandra Ocasio-Cortez's policy proposals constitute a true critique of liberalism. Single payer healthcare has been a -- if not the -- desideratum of the Democratic party for decades. The same can be said, I think, of other of her ideas. She's advocating a more interventionist government that's consistent with liberalism, really, a kind of retrieval of mid-20th century liberalism that looks beyond the Reaganite revolution.