If we sign Miller at right-back, and I have a feeling we will, then we're only looking at signing one other starter (striker) and then one or two other squad players. So it's not that big a deal - Doolan's good enough to start at this level anyway, it'd just be nice to bring in someone of similar/better quality.
It is a bit of a pain in the arse waiting around for signings when you see other clubs, like County and Killie, making decent acquisitions early doors. Not worth getting too worried about though.