For the re-run comment. Get it down before Wednesday, mmk? If you have to skip a week because people couldn't play or you just couldn't get your raid together to down all the bosses or w/e your goal was, then that's just a cost you pay as a guild or whoever you're running with.
Tbh, excluding Sat/Sun (possibly Friday), it really doesn't matter when the raid week begins / ends. If yours "began" on Tuesday and the Raids reset on Wednesday, well then I guess your raids now "end" on Tuesday and you start on another day. Adjust your play schedules, and if you can't do that or your guild won't compensate, then reevaluate how much you want to be with that guild vs how much you want to raid. I'm sure most guilds will adjust their timeframes to match and then become very successful despite it being on a Wednesday.
Do keep in mind as well, this isn't Blizzard with 24/7 staff. Though Warmane does have some staff available 24/7 (I assume :P), their own "behind-the-scenes" schedule has made Wednesday the best place for Raid Resets. I haven't been keen enough to keep track of which day of the week they release patches, but I am positive that it lines up with the the Raid Reset so they can apply fixes without messing too many people up.