100 + 200 vs 70-200 2.8 non-IS?

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I have the 100 2.0 and 200 2.8 for indoor volleyball and other stuff, but am teetering on considering selling them for a single 70-200 2.8 non-IS. My other lens is the tremendous Sigma 17-50 so the zoom would have the same filter size (polarizing, etc.).
I really like the image quality from the primes and the smaller size is a bonus, but keep coming back to the zoom. Would I take a hit in image quality? If even a little I'll likely stick with the primes.
Thanks for any insight.
 
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