Don't agree with all this long term stuff - it's just an excuse.
Gustard had the option this summer to recruit experienced players to cover weakness and do an immediate job - just as Deano did with Quins in the Championship. Other recruits could be more medium term and be introduced into a settled side playing to a successful gameplan the squad are all comfortable with (eg Sarries, Exeter).
The essential first job for any new coach is to go back to basics. By simply reducing errors and penalty count they will have an immediate effect on momentum and possession. They can then introduce more ideas as the players gain confidence.
If endless rotation is not successful then Gustard has to field his core set of XV players to do the job and gradually introduce the best of the rest/most able to play the system.
Otherwise the DoR not only looks clueless - he is incapable of working out what's happening in front of him on the field. Two or three more seasons won't change that (ie previous two DoRs).
We still have to see how Gustard wants Quins to play - but (as said before) he has up to the Leicester game to prove his worth.