The OVERRATED Steinbeck merely became a favorite of "educators" due to his socialist politics and flair for self-promotion. The only thing worse than the Grapes of Wrath was the horrible movie they made of it with Henry "Jane's Dad" Fonda.
Actually just the OPPOSITE happened starting in the 1950s. Steinbeck fell OUT of favor as he became more conservative. In fact, Columbia University for a long time refused to teach anything based on what Steinbeck wrote. BTW, Steinbeck was a good friend of writer, James Jones. Oh, and did I mention that I NAMED my newborn nephew (born last December) James Jones? James Jones Guttierez. We use the FULL name, "James Jones" and NOT the shorter "James."