Lindsay Tanner to retire at next election.

During Question Time today Lindsay Tanner announced he will not be re-contesting his seat of Melbourne at the next election. Lindsay will be sorely missed by myself and others, he was a great performer in QT and very quick-witted.
The ALP was in danger of losing Melbourne to the Greens at the next election and I think the retirement of Tanner may just send it over the edge.
What are your thoughts on Tanner retiring?