I feel like Product marketing is in a similar place where Product Management was 15-20 years ago. With that said, how do you see Product Marketing growing over the next 5 years?

I think Product Marketing will shift beyond product launches and research to a craft that focuses on business and product growth strategy. Meaning, PMM will take more ownership over revenue targets, setting the strategic direction of a business line and product, and then providing the strategic plan that other cross-functional teams will execute. Many companies already do this (like Adobe) and I think others will soon follow.