The drop off space has become a bit of a joke. Time to consider moving some of the coach activity to the long-stay car park in front of the old terminal; it's only just through the tunnel and much closer than the equivalent area in Dublin. That said the Bus Eireann and Citylink bus services should stay in front of the terminal (a timetable for the Kinsale-bound buses might be handy too; most people probably don't even realise there's a direct bus service...).
An alternative could be to reduce the queuing area for taxis. They all have to queue up by the hotel anyway, so there's no need to reserve so much space in front of the terminal. It made sense when all queuing taxis could be accommodated there, but once the overflow area was created, there was no longer any need.
Regarding Aer Lingus going to 4 in Winter, if it happens, it's most sensible 2 A320s and 2 A319s. Some of the existing routes are a bit thin in Winter. Also, moving to A319 operation could allow higher frequencies on some existing routes (notably Paris) and could allow some Manchester and Birmingham flights to be A319 operated (depending on the deal with Aer Arann).