The uptick in HRs is not just because of the three true outcome approach to hitting. There have been physical changes to the baseball, increased internal density has been scientifically proven, which has given the balls more bounce, but the ball also has less air resistance due to lower seams. This last change also has led to pitchers that spin the ball not getting the same movement on their pitches.
These changes to the ball have encouraged the three true outcome approach. I guess most deeply engaged baseball fans are not fans of this style of baseball. As I don't think there is any way to really speed up the game without either adding some new gimmicks to the game, like a pitch clock, and limiting pitching changes, all which altar the purist flow of the game (of course, if they would limit TV commercials, even by just 30 seconds between breaks, they could really speed up the game, but unlikely they will never do that).
I'd rather see them skew the game back to the pitcher's advantage, I think if the ball was more neutral and it was harder to score runs, situational baseball would make a comeback. Games would naturally get shorter due to a rollback of huge innings. I just don't enjoy seeing nightly highlights of swings that used to die on the warning track going 10 rows deep in the stands, it devalues the HR, which used to be rarer and really exciting, now they happen seemingly multiple times per game.
I also see it unfairly hurting pitchers, a lot of them "regressing" due to not having their breaking balls being as effective as they used to be. If I was a MLB pitcher, I'd be pissed off, especially when it comes to their next contract, where their artificially inflated stats will surely be used against them in negotiations.
Bottom line, fix the ■■■■ ball.