Yes and no. O'Neal was a superb talent as a middle blocker both as a blocker and as a hitter, and none of us will ever forget her 5 ace performance against Nebraska.
But Singletary was terrific this year. When she had a strong blocker next to her (like Kahahawai, who played very little all year), the lid was on. Singletary unfortunately was not often paired with strong blockers on the front line. As a result, she had 18 solo blocks this year to O'Neal's ten in her final season, but O'Neal had slightly more total blocks per set, because she often had strong blockers beside her in Phillips and Swindle. Singletary didn't have much help in blocking when she was on the floor because Kahahawai played so little.
I think we'll be fine next year despite losing a plethora of hitters. Singletary and Ames should be a great duo of middle blockers. Kahahawai hit much more strongly this year than in years past. We'll find a plug in immediately gem in the incoming class of hitters (Spears, Vander Wal, Gaido). Lauenstein may be ready to function again. Byrd should have something to say about who plays. We may not be natty chasing fine, but we'll undoubtedly have a good team again.