I agree that too many teams already make the playoffs.
I almost wonder if MLB is doing this top create an illusion of parity?
For example, if there are 4 wildcards and the Reds win one of the wildcards, that's considered going to the postseason and likely helps sell tickets the following years.
IMO, if anything, MLB should revert back to just one wildcard. That was a reasonable compromise with 3 divisions in each league. Adding a second wild card mucked things up, and even more wildcards is going to make it worse.