I have mixed feelings. On one hand I can absolutely see m4a being awesome if implemented in the laziest way and I can see Trump winding up doing that purely for popularity (highly unlikely but not impossible). But I imagine it's more likely to be like tricare and i imagine it would explicitly exclude politicized Healthcare like abortion, birth control, and gender affirming care.
US Healthcare is in a pretty bad spot as it is, any durable improvement would be an improvement nonetheless. Just like how the Affordable Care Act was a significant improvement over the wild under-regulated denial-fest that the pre-ACA insurance industry was