Data lakes are based on new technology. This is a new methodology. Of course there's a risk, but no real progress is ever made without taking some risk.
Understand what data liberalization means for your organization and how you can use it and the new class of tools surrounding it to make better, more informed decisions. Understand the new technologies and their capabilities (like streaming and finally forgoing being stuck with canned reports). Don't be scared because an analyst firm wants $200 for a five-page FUD report with an eye-popping title.