Well I was saying I don't see it happening very soon. Inderos was stating that the mountain slice was showing that Law might backstab the Strawhats, and I was just saying due to the way Law spoke of them in his call out to Doflamingo it didn't sound like he intended to back stab them this soon. Now once all this is done and Law has no use for the Strawhats assistance? Maybe.
But I'm still banking on him just ditching them when they are in a jam really.
Yeah, I don't see the "betrayal" being that much of an issue as it's already happened to some degree with Robin, who was also a mysterious and questionable ally before Water 7. Sure Robin's betrayal was out of the safety of the crew, but it's not like the rest of the Strawhats have really warmed up to the alliance that much and are only part of it because Luffy gave the okay. Also, while Law is/was certainly using the WG and CC toward his own ends, Luffy doesn't seem like someone who would immediately threaten his immediate plans of carving out a piece of the New World.
I guess it depends where things are after the Yonkou which Law has is crosshairs on is dealt with (has to be Mam at this point). Even if a double-cross does happen I doubt it will have any huge effect on Luffy different from his usual setbacks unless he does something drastic like try and kill his crew.
He'd already allied with Buggy for crying out loud who had an even bigger chance to double cross him (and essentially did) and Crocodile (who surprisingly didn't).