The less grim analogy would be what if a singer's career was ruined, and they waited until their enemies were dead to make a comeback and their style of music was no longer popular? But here is the grim truth.
The social policies of the wizarding world were changing. Look back at Voldemort's school days and the opinions of Sirius's parents, the Malfoys, etc, back then being less than pureblood meant you were somehow not only inferior, but less of a person. Then in Harry's parents generation attitudes were more accepting of muggle borns and half bloods. In Harry's school days blood supremacists were viewed as all out nasty people.
This mirrors the shift of attitudes toward non-Christian whites in the real world. The Death Eaters are like a mix of the klu klux klan, the Spanish Inquisition, and Nazis in WW2. Just like (at least in the American social circles I am part of) neo-nazis/white supremacists, and other extremist right wing movement, there is just too much of a gap between those beliefs and the mainstream.
That means that Voldemort would be WITHOUT A PLATFORM. If he waited to come back to power, the next generation of Death Eaters would probably be like the Klan today, viewed as a domestic terrorist group, members would be ostracized if discovered by the public, a bit like the way communists and socialists were treated during the McCarthy era. I'm just looking at this from a political point of view, but these parallels were intentional on Ms.Rowling's part. I don't have the articles on hand, but they are very easy to find. Harry Potter is as much a series about acceptance as it is a series about friendship, doing what is right, and bravery.
(edited for formatting)