That depends on a number of factors. Many pools can not be safely drained. Even if some particular pool can be drained, water is much more expensive in some places that others. It would cost me several hundred dollars and take four or five days to drain and refill my pool, and then cost more money to get the TA and CH levels right again. Depending on how much baquacil was actually in the pool, draining could cost more and take longer.
And, even if you do drain and refill the pool, you still need to go through the final stage of the conversion to get the last of the baquacil hiding in the plumbing and then replace the filter media.