If we do qualify for Europe, we'll go out at the qualifying stage. We might get four games.
I don't see why hoping for a top two position next season is unreasonable. As Clough's ideas have settled and his squad has started to take shape we've been consistently around the top of the form table. As noted above: all we need is a right back (Freeman) and a centre forward (maybe Alex Niemley from Man City - he's out of contract and at 23 needs to find a club for regular first team football).
Frankly, given their resources compared to their competitors (with Wolves going up we will have far and away the biggest crowds in the division), Sheffield United should always be expecting automatic promotion as long as they are in the Third Division. Doesn't mean we will get it, but saying stuff like "we need to build slowly and we might make the play offs" is just selling ourselves short.