(They have indicated that they are working on full 24-person pre-formed alliance support.)
Of course this is all speculation. For all we know, they might just lay out treasure caskets at the entrance and the challenging mechanics and splitting pathways are just Turn 3 style lit platforms. Obviously, we reason that this is probably not going to happen.
Most of us think it's also fair to reason that the new duty kick function will not be nearly as powerful as it needs to be to weed out trolls/griefers/AFKers/rude/offensive/bad players, based on SE's design philosophy (they don't even want us sending /tells in duties because they're afraid we'll be mean) and resistance to the idea in the first place.
Do we honestly think that it will give pre-made parties the freedom to kick out all other 16 players and keep cycling through until they find other pre-made parties, at the very least? Common sense says that it will, at minimum, be decided by majority vote, in which case the pre-made party will never be able to win votes on their own. But yes, you're right, anything could happen, maybe SE will decide to throw common sense out the window? Sorry, not sure how your argument is valid here.
We don't have to see how it plays out. A reactive community is the death of this MMO. By waiting up to two content patch cycles to make our concerns and needs known, many more players will be fed up with the state of the game and leave. This harms everyone, whether you agree with why they left or not.
We need to be proactive and decisive about our needs and generate solutions in dialogue with developers about what works, what doesn't work, and what's possible. Why even have this forum at all if that's not the purpose, to make our concerns known? If our concerns prove false, then what's the worst that happens? Are we causing harm by saying how we feel? Seeing as these discussions have no negative impact, you are not justified in coming on the board and saying that we are not justified in our concerns.