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Because of the extremely high Ks I think his chances are below average. All the successful comps were power hitting types with little or no defensive value. Possibly because they hit enough HRs to make up for the holes in their swings.
Even then, only 9.1% of the 24+%K group ended up having careers with a few years of 2 WAR seasons or better. Another 13.6% sticked around as MLBers for 1500+ ABs as below-average regulars or back-up players.
In general I don't think its efficient to spend time developing below-average players, so Trayvon is worth it in the scenario that he hits enough and fields enough to stick as a regular.
Span has averaged a little over 3 WAR over four seasons by both fangraphs and Bref (they use different defensive systems). I think trading for someone like Span and trading Trayvon away (perhaps in the same deal) is a better strategic move if it can be done.