Product portfolio management was a big strategy BCG employed in the 80s and 90s. I think most companies now know how to assess products to invest in, harvest, or cull.

A lot of basic statistical analysis, including regression of sales data, is no longer solely the domain of consultants. Similarly, cost level analysis (unit costs, profitability levers, margin analysis) is often done in-house via Financial Planning & Analysis teams.

The easiest sign of this is that many ex-consultants work in F500 companies so they bring their prior knowledge in-house.