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I think it comes down whether or not Wells can continue to hit for his kind of IsoP and where his BABIP levels off.
Wells has improved at the MLB level, but his BABIP ability is yet to be decided. He wasn't a high BABIP guy in the minors and currently is running a BABIP over .350 in the majors.
His low LD, high pop-up approach tends to lead to low BABIPs. Typically guys of this skillset run a BABIP below .300.
If his his true-talent is around a .300 BABIP it should be enough for a low/mid 700s bat. If his true-talent BABIP is below that, he probably won't hit enough to be a regular.
Wells could also improve by raising his BB rate as he gets more comfortable (higher BBrate in the minors).