Since it is to some extent a numbers game, yes, academics (especially newer ones looking to build reputation) will submit quantity over quality. More tickets in the lottery means more chances to win.
I'm not sure though how you change this. With so many voices shouting for attention it's hard to distinguish "quality" from the noise. And what does it even mean to prioritize "quality"? Is science limited to 10 advancements per year? 100? 1000? Should useful work in niche fields be ignored simply because the fields are niche?
Is it helpful to have academics on staff for multiple years (decades?) before they reach the standard of publishing quality?
I think perhaps the root of the problem you are describing is less one of "quantity over quality" and more one of an ever-growing "industry" where participants are competing against more and more people.