Jp24,
I've studied baseball history extensively and even as far back as the early 1900's, Connie Mack who managed the A's for 50 years stated that baseball was 75% pitching, so nothing is new in that regard.
If one studies baseball history, it seems that there are cycles that last up to a decade sometimes of pitching dominance or vice versa. There are also multi year cycles where things are pretty balanced. After the barrage of hitting due to a combination of PED's, small parks, team expansion, overall poor pitching and a group of great hitters, ML baseball has cycled the other way with some hitter negative parks in San Diego, San Francisco, New York(Mets), and Seattle as well as the balls not being as lively in Colorado due to being kept in humidors.
A tremendous crop of young pitching as well as hitters who try to do nothing but hit the long ball and strike out 140 to 220 times a season, even the leadoff batters, as well as the new defensive shifts and new emphasis on defensive value as well as the umpires shift to calling the lower strikes has all sparked this new cycle of dominant pitching.