Not fair to make people wait more than one round; chances decrease exponentially for international students anyway after R1!.
I spend too many months on the WL of a school - gave me mouth ulcers and sleepless nights but the ding itself didn't hit me hard. This was four years ago when I applied to one and only one university @ R1; they finally dinged me months later at the R3 deadline. This year another school ended my misery at the next round deadline itself.
BTW, even if you have a valid multiple entry visa to the US (or even are currently in the US with an H1B or something) it doesn't help since you HAVE to go for the visa interview and convert to F-1, right? So, if we don't get converted before mid May (at least?) I think it's as good as a ding - I'm sure the MSB ad-com knows that. I guess they are expediting things for International Applicants ASAP and we'll hear from them soon.