Pretty much.
Erasing the Spider-marriage was actually akin to getting rid of the Super-marriage - in both cases perceived as a 'rolling back' of the progress the characters made over the last couple of decades. Of course, in terms of the actual mechanism for the change, Spider-Man was affected minimally compared to Superman, who was actually rebooted along with the rest of the DCU. Also, in Spider-Man's case, there has been progress made on other fronts with the character and the stories of the new single Spidey have largely been good (or at least mostly not bad). Not the case with Superman in the New 52.
As far as a Nuperman book goes - I've said it before and I'll say it again, a Superman book set in the past would cater to that market while at the same time fleshing out Superman's backstory in the Rebirth universe. A 'Superman Year One' - style series would feature a younger, single Superman and honestly, he would be indistinguishable from 'Nuperman'.