#2 It sets a wrong precedent
It may be a sensible move to make for various reasons, but the reality is that the making of the Floyd Mayweather vs CM Punk fight in the UFC could only be a precursor for others to want to do the same. After all, who would not want to make an easy paycheck?
Similar to the previous reason, finalising this would foster the idea for other fighters - of genuine hype and popularity - that attaining high-profile fights is more about the money you'd be able to bring in, as opposed to the hard work.
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It's bad enough that this appears to be the recurring trend in the UFC and MMA today as fighters often feel the need to "sell" their matches for supporters to have high expectations months in advance, though making this fight would only go a long way towards solidifying a dangerous mindset going forward.
As an old saying goes, "the love of money is the root of all evil," something which is beginning to prove blatantly true in the MMA realm today.