If we want to sell more, we can sell more. It doesn't have to happen through salesLite though. Let's say bonds are taking in $20k per day and salesLite is bringing in $10k per day. We could run both, or we could just lower the BCV by 33% to add an extra $10k in capacity to bondai.
The only difference I see is:
With bondai, the bonder might use their own dai or sell into the pool (-3, -3) to buy the bond. There's some probability between 0-100% that the dai comes from the pool.
With salesLite, that probability is 100%. It's a guarantee because it is literally selling into the pool.
Phase out will certainly be a vote option though. Though i think bond-only is better, having both isn't necessarily a bad thing.