S/T techs can be very different from each other, like Minato's and Tobi's. And Madara might not have time to figure out how they work if Tobi does what he did with Minato and warp him right away (Minato only escaped with FTG).
Susanoo's activation wont help at all if Tobi warps Madara
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where Susanoo doesn't reach. U_U And Susanoo's activation isn't as instant as FTG either. Madara would have to realize the situation, activate his MS, and then use Susanoo.
So if Tobi decides to warp him right off the bat, Madara will somehow grasp the situation, activate MS, THEN use Susanoo all while Tobi has already begun warping him? That's not happening for sure. Minato only managed FTG in this situation, when Tobi alerted him of his presence first (not happening if Tobi comes behind Madara).
And Madara doesn't even us the MS right off the bat, so this isn't happening for sure. He's done for if he doesn't use Susanoo at the very start of the fight (which Tobi will then warp him from inside Susanoo).
What if Tobi warps behind Madara, like with Torune? The Sharingan can't track what it can't see. U_U
The fact is Madara will be just like Torune. Tobi warps, Madara doesn't realize it, and Madara's gone. Madara can't realize what's happening with no intel on Tobi's S/T techs, turn around, activate Amaterasu (eyes bleed), then hit Tobi before he gets warped away.