Wind power is almost always producing something. This production can be statistically modeled. Thus, you can overprovision wind and say that on average, your target of <x> MW is met or exceeded <y> percent of the time. So wind, if planned well, doesn't really need big storage.
Baseload generation is also a fallacy. It only matters that demand is met. Wind has already become the "baseload" in the UK in that wind operators always undercut everyone else on the market, thus displacing other generation.
Baseload demand is the point which demand never falls below. Back in the age of coal, it made sense to meet this baseload demand with large baseload plants, that were big and did not change output and gained economies of scale.
One challenge that I think people overlook in the shift to renewables is grid frequency stability. Big thermal plants have heavy rotors that have a lot of inertia, stopping the grid frequency from changing too quickly in an imbalance. Replace these with inertia-less wind and solar, and you will need another solution for grid stability.