I voted no. However, if they did it well I may changed my mind.
My principle reasons against trios are technical.
1) I am not convinced that a trio would work well on DB. Trios in porn depend heavily on close-ups and changing angles so you can get an overview of the scene as a whole. This is not possible in DB. I see the inability to shift angles a real problem. This means that even if you can see well what one girl is doing, you may not be able to see clearly what the other is doing. Sometimes the angles are poor with duos. So this problem will be even worse for trios.
2) I am of the view that the more people you have, the more planning and choreography you need. For a trio to work well it would have to very well choreographed and that may make it look less natural. While if it is not choreographed, it could turn into an amateurish mess.
3) Trios would cost more, but there is no guarantee that they will be more popular and generate sufficient revenue to cover the additional cost of production. There will be some who will buy eagerly. But whether that will translate into significant extra sales is another matter.
However, despite me voting no, I don't object in principle to the idea of trios. The idea of one model being worked on by two others is possible. But how I see it really working is two together while the third effectively does a solo show. So in reality, most of the time you will probably end up with one duo and one solo in the same show rather than a trio.