Holliday himself isn't a huge concern, it's the whole Oakland situation. If you have tons of speed and find yourself dominating in steals, but falling behind in power categories each week, then it's probably a good trade for you. Is this a head-to-head or roto league?
If it's H2H and you're just killing people with speed, but lacking in what Holliday gives you, then it would make reasonable sense. You can actually check your overall total stats in the league versus others folks. Sometimes I use this to gauge if I'm overloaded on something like SB or Saves, etc. It's early in the season, but you can tell if you're over-zealous in a category and make the call from there.