3DSytems’ new Figure 4 range uses a ‘non-contact membrane DLP’ system, so it sounds very much like something similar to the Carbon machine. So there may be a number of ways to get around the Carbon membrane patents. Whether these will become available to the smaller manufactures in the near future is a whole different question. The Figure 4 printer start at just less than £20k for a standalone machine with build envelope the is less than half the size of a Form2.
From what I have read Carbon seems to be pursuing a course which focuses on resin chemistry, they already have a number of two part resins. I suppose a subscription model would allow them to able to swap out the light source to match the customer’s use of the more exotic resins.