There probably are, but the main reason to not bring the technology in is there re no clear rules defining a check swing. The Wilmer Flores check swing that obviously inspired all this was, unfortunately, not an incorrect call per the rules.
But that doesn't mean MLB shouldn't embrace technology for other aspects. They already employ instant replay, and while they do misuse it IMO sometimes (primarily reviewing slides into bases to see if the runner eer broke contact with the base), they otherwise do use it to fix a lot of otherwise bad calls. Unlike in the NFL, however, a lot of MLB calls being retroactively changed via instant replay just don't work in MLB, mostly because of where to put baserunners. Thats why fair/foul calls are limited to home runs.
So before we go using slippery slope arguments, MLB and other port have implemented technology to ensure proper officiating calls are made at a higher rate. Have any of these implementations lead to slippery slope situations?