They'd need a stage0 systems built specifically to support a 15m large fairing. I'm not saying this will never happen, I just don't think it will be on the card

They'd need a stage0 systems built specifically to support a 15m large fairing. I'm not saying this will never happen, I just don't think it will be on the cards for a long time, if at all. Basing things around 9m/12m may be a better idea if they want to get something in the sky sooner, rather than later.