If I had to guess their choices.
Wigan, Warrington, , Saints, Huddersfield, Bradford, London, Salford
Wakefield, Widnes, Leeds, Catalan, Castleford,
Hull KR, Hull
I think Wigan, Warrington and Saints would all like more games against each other as these provide pretty much sell outs, therefore more cash in the coffers.
I think Bradford, Salford and Huddersfield are all aspiring to be top 8 clubs wanting to be winners so securing that top 8 will be good for them. London I think would vote yes as it would take some pressure off them in terms of competiting against clubs with 10 times the amount of fans, but would not lead to them dropping out of the top flight.
I think Wakey and Cas who have put a lot into staying in SL, would not welcome the possibility of Yo-yo ing. Same for Widnes. I think Leeds probably don't care one way or the other. Catalans might fear a bad run axing them from SL all together.
Hull FC and Hull KR, I could not even speculate as to what they may think, it could end up taking their derby away or at least the possiblity of the return fixture. So it could be a tight vote.
But it's all speculation until a chairman comes out for or against the idea.