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[ASOIaF] What if Renly Baratheon took the throne?

Renly wipes out Stannis, marches on Kings Landing with his massive host, seizes the city and takes the throne. How will the War of Five Kings play out?
gpt
I believe he had agreed to let Robb remain King of the North, didn't he? So, once Renly took the south, he'd be just sort of done. Robb would've been able to focus on the North.

I think the Greyjoys hadn't invaded at the time Renly was killed. If there was no war to distract Robb, and no reason to send off Theon to get an alliance with Balon, there would've been no war in the North. Even if so, if Robb's host had been at Winterfell, it wouldn't have been sacked.

It's hard to say what would've happened with the Freys. Robb may have gone through with his marriage contract (he met Jane Westerling on the field of a battle that wouldn't have happened), or he may have met her elsewhere or met somebody else and fucked it up anyway. However, without the war, Robb wouldn't have been in a position to get himself killed regardless, and the Lannisters wouldn't have been there to back the Frey in Robb's killing. So breaking a marriage contract would have had little impact on the anyway.

Only question is whether the realm would be any better prepared for either Dany or the White Walkers when those come into play. (I haven't gotten that far in the books yet, incidentally)