I don't think this will happen. I'm pretty convinced that we will win North Carolina, Alaska, Colorado, and Iowa on Election Day, and even if we don't win Kentucky, that secures 50 seats for us then to lose Louisiana and Georgia in runoffs. This all of course assumes a Democratic loss in Arkansas, which isn't necessarily a guarantee.
Well, yes, the Democrats could win all four races in NC/AK/CO/IA, but it's possible that at least a few Senate races will take several days to call, possibly including any number of those seats that you mentioned. On the Wednesday after the 2012 elections,
two Senate races were still too close. A day after the 2010 elections, no less than
three races were still undecided (interestingly, all three candidates holding a lead at that time - Murkowski, Murray, and Bennet - went on to ultimately win their races). Also, a day or two after 2008's election,
three Senate races were still too close to call, just like in 2010. So, it is possible that Louisiana and Georgia might not be the only states that don't give us final results on November 5. Personally, I could realistically envision all four of the races you mentioned being too close to call on Wednesday morning, and if I were a betting man, I'd say at least one will be.
OP's scenario is one that I could see happening in November.
