Assuming Turnbull wins the next election, which I think is a reasonable assumption, my guess is he would likely want to retire before the following one.
He's got what he wanted out of life - to be wealthy and to be PM. He will probably get bored fairly quickly.

The question is, who would succeed him and lead at the following election. All of this assumes Tony Abbott won't try to upset the boat which is not impossible.

My guess it would be Morrison. In fact there may have been an agreement with Morrison for his support in dumping Abbott.

I want Abbott back

bogarde73 wrote on Jan 20^th, 2016 at 10:15am:

Let's assume for the sake of argument that your scenario comes to pass: Turnbull leads the Coalition to an election win and he then retires from politics, and Morrison were to lead the Liberals.

Morrison would be a bad choice of Liberal leader. He may appeal to the Coalition's base but not the swinging voters.

It would be similar to the Labor succession in Victoria in 2007, when the immensely popular Bracks retired from politics without ever losing an election and was replaced by the less well-liked Brumby. Labor lost the following election.

Morrison is similar to Brumby; he does the job well enough but is not well liked.

If Morrison were to become Liberal leader he would also be likely to lead the Liberals to an election loss. He is unlikely to be facing Shorten. Shorten would probably relinquish the Labor leadership after an election loss. Would Morrison do well against, say, Plibersek? Or would his tendency to be a political hard head drive voters away? The latter is more likely.