A part of me wants to see something new, but the borg on the other hand are fantastic. One of the most terrifying enemies ever to be in any fiction.
They could be brought back into the new universe, but with a difference. What I dont know. But it still needs to be along the terrifying lines they were on when they first appeared in TNG. Dont like Queenie though, but a bunch of Cubes chasing you around the Milky Way could work.
As someone else said, use the Q more, whether its the Q we all know and love or another member of the Q, so much more could be done with that.