The curious thought is what will be the catalyst for acceptance on other major exchanges from now until then.
Profit motive will be the catalyst for acceptance on other major exchanges.
Other exchanges are letting Polo have a monopoly on all the sweet sweet trading fees it's getting from facilitating ~100% of XMR's multimillion dollar volume.
But it's difficult to compete with Polo's liquidity, lending, and margin trading. Those are killer features.
EDIT: I've heard from an impeccable source that
Monero's lack of multisig is *THE* constraint on large exchange listings, as their security models (and perhaps contingent insurance policies?) require that functionality.
That's why I was asking how we can speed up multisig development, with the goal of achieving implementation parallel with or soon after RingCT.
I will ask a math PhD buddy if he can do the peer review himself, or help find a qualified specialist, then put up a FFS request based on his feedback.