I have resurfaced a ball that has over 700 games on it and was soon going to be retired. My buddy got a spinner, and that was the first ball that I resurfaced. I pulled it out on a third game of a set which didn't have 2 good games to start, so my expectations weren't that high. Needless to say, the magic in the ball was back, and it fit into a place in my arsenal at the bottom when the lanes are breaking down.
So IMO yes, resurface it, you may be surprised with the results.
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Let in the DOGS - I've got a HAMBONE for them!
To all the haters, get over it!