I'm not saying to avoid dating novus ordo-ites, but...(and i've had plenty of personal experience in this area)...trying to find one that will convert to tradition is just as hard as finding a trad to marry. Most novus ordo catholics are happy where they are; they don't want to have quarrels in their family; they don't want to be different; they want a 'normal' life. Also, the pope is like their god-given oracle, so they won't leave him.
The problem is, most younger folks are not strong in their faith, they don't have any strong convictions on why they're Trad to begin with (because they don't study the past), so to them, "the indult is a latin mass...what's wrong with that?" This is the easy way, which most take.