Here are a couple of ways that come to mind:
-- Suppose a married gay couple, or even one of the partners, starts studying the Bible with JWs and decides he wants to baptized? Would the JWs require him to get a divorce? Wouldn't that be incontrovertible evidence that JWs do, indeed, break up families?
-- Suppose there is a JW with a latent or closeted homosexual inclination meets another JW in a similar situation. Sparks fly, they begin dating (to the JWs, it just looks like 2 guys hanging around together) and then decide they want to marry. Of course no JW elder would agree to perform the ceremony, nor would they allow the Kingdom Hall to be used for the ceremony. Isn't that discrimination? What would the legal consequences be if the JWs refused to sanction the union?
Of course, no gay person in their right mind would have any desire whatsoever to be a JW, but if there were some gays who wanted to "fake it" and cause trouble for the JWs, it wouldn't be hard to end up with situations like the ones described.
Any other thoughts on how this new ruling will / may affect JWs?