Cuomo is the only Democrat with any chance of beating Bush. If he doesn't run, the Democrats are totally screwed. Bush will utterly destroy the others, especially some womanizer from a small southern state.
You are right If Cuomo isnt nominated I see them losing badly just like they did in the 1980s. And if they lose this election not only would they lose the Senate and maybe the house , they wont have a shot at winning the White house till 2000 , as by 1996 the economy will likely be great again , and the Soviet Union will likely have collapsed by then so I see the GOP winning in 1996 again. It's looking more like 1980 was 1932 in reverse instead of a repeat of 1920.