One problem: the 800 pph capacity.
Why is that a problem? Outside of Disney and Universal, I can't think of too many dark rides that come anywhere near 800 pph. Think about the average Sally Dark Ride with two or four passenger individual cars on one track (i.e. SFFT, LC). They have capacity in the 250-400 range, which results in dreadful wait times.
Hershey's ride will probably pull 45-60 min max on most days, which is about the max wait time you'll find for Storm Runner (also about 800 pph).
Plus, we're talking about Hershey here, so they will squeeze every drop of capacity they can out of the thing by having both tracks and as many cars running as possible.