Don't dump it, and don't add sugar. Make a simple low ABV (6%) mead and when its done, blend your cherry wine in to taste.
My cherry wine experience is this: I picked a big bucket of tart cherries, paid the grower about $25, smashed them up, no water added, bud did add some sugar, used wine yeast, made about 1.5 gallons of wine that didn't taste like cherries at all.
It was ok, but ended up blending it with several different cherry flavors to make a more drinkable product. My 2 cents: Skip the cherry wine and use whatever cherries you can get to flavor cider, mead and beer.
Sweet cherries might be a nice addition to a full strength mead. But all I've ever used is tart cherries.
Its best to add them in secondary so you'll get a little more flavor.