Does that mean Denard Span's deal was a mistake?
You aren't even comparing apples to apples here. Span had come off of two seasons posting an .800 OPS, strong on base skills, and above average defense at a key position. Revere has played for essentially 1 season and has done only the defensive side of things. There's legitimate question as to whether or not he will ever be able to top a .750 OPS and whether his on base skills will improve too. While Span didn't have a ton of minor league success either, Span did show improvement and then got the contract. If Revere can do that for two years, I guarantee you they will give him an extension to buy out his arb years, but if he does not, they should not.
We're not going to go anywhere this coming year, likely not next year...so trading Span for Meyer made sense when you look at it that way and it makes sense to do the same with Revere. Heck even Willingham. Bring up Hicks and Arcia, let them get their lumps and then they aren't getting their lumps when we're geared up to be a lot more competitive. Hicks has nothing left to prove and Arcia certainly doesn't