You may be correct, but only because costs continued to rise over the course of last gen. When 7th gen started, the threshold for success was typically around 1 million units. By the end, we saw a lot of publishers disappointed if their title couldn't clear 5 million units.
And this is while publishers worked to leverage their established engines and took increased advantage of DLC as a tool to increase revenue.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.