Winfield, your map favours Republicans and underestimates the number of people who would have voted Gore over both Bush and McCain when it came down to it. So does yours, Spl2, to a lesser extent.
What you say could ultimately have happened in the 2000 election, however, if any independent ticket could have made these kinds of inroads, it would have been McCain and Powell. Both were well known, respected, charismatic, in contrast to both the Bush/Cheney and Gore/Lieberman tickets, that were really not exciting tickets at all.
Besides that, both McCain and Powell had the credibility to actually be President and Vice President, unlike most independent or third party candidates, i.e. Nader, Buchanan, Perot.