For the nearly and basically just recently past 20 somethings, don't assume YOU will want the same things all of your life either.
When you hear of people that have spouses (often wives it seems as men seem to complain about it more so), that dislike their husbands over interest in a hobby activity or sports, what is likely the case, is the person didn't truly find out enough about the person they married before getting married.
I have been married 25 years now, and it hasn't always been a rosy event. But the key detail is the bumpy parts have never had anything to do with my hobbies. Life throws curves at you, and it's how you deal with them that determines a lot of things.
One of my oldest closest buddies has recently likely shot his marriage in the head. It wasn't any of his hobbies though, but rather, it was some of his beliefs. His belief that as long as he doesn't mind her getting some extra when he was away from home for a while with work, that it was ok for him to get a little extra when he was away from her for a while thanks to work. It appears he was mistaken in that idea.
I build models every fucking day some weeks. I have a whole room devoted to my hobbies here. I am usually IN my hobby room if I am anywhere in the house.
But I have ensured she gets her own space too, and I do make a point of being WITH her during the day. Heck I make it fairly plain she is top of the list on my list of things I like eh. Every morning we have sex when I wake up. She would need to be plenty dense to think I need anything else in my life more.
You 20 somethings have a much higher chance of getting bored with anime long before you get married, than you do having trouble liking anime while being married.