Quote Serge A. Storms="Serge A. Storms" What you are saying is leave him where he is until Sinfield retires and then ask him to take over - that seems a bit haphazzard.
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Not at all.
Firstly, this isn't about personal development of an individual player. Its' about what's best for the team.
For now, and the foreseeable future, what is proven to be best for the team is the triangle of McGuire, Burrow and Sinfield. Ablett has found his role and done very well with it.
On the occasions that Sinfield is injured or has to play in the halves we have excellent cover with Ablett but that is as far as it should go, IMO.
I wouldn't dilute the team now to begin preparations for an event 4 years down the line.