Do we really want this sort of drama? Sure, this would give the Republicans the entire government (provided that they win the Senate), but if they lose the PV or even have it this close after this much, the Senate Democrats will have the ammunition they need to fillibuster.
Drama? This doesn't begin to give us drama. Suppose the Senate is split 50-50. We might well end up with Romney/nobody winning. I don't say that because I think Ryan is a nobody, but because we might end up without a Vice President.
With a 50-50 tie, the Dems will get to organize the Senate at the start of the session because of Vice President Biden. But it takes 51 Senators to choose the next veep sworn in for the new term as this vote ain't one Biden can break a tie on. (Nor would it be decided if a vote was called while a Senator was stuck in the bathroom. A 50-49 vote does not elect a Vice President.) With the Democrats having already organized the Senate, if there is no Vice President, then President pro tem Leahy would preside over the senior house.