While most of your ideas are great (especially the group cars, in-game betting and fishing), the marriage part is just very unlikely to happen.
Yes it still counts as an idea, but it's a dragon ball game, people are mostly interested in fighting, gears, costumes etc...not so much on marriage, as cute as that idea is.
It works in other original mmorpg games, but not in dragon ball exactly, people are free to disagree of course.
We know, Goku and Vegeta got married, so being able to do that too would be kind of fun if i'm being totally honest with you.
But considering how old DBO is, adding that doesn't serve much purpose, it'd be better to think more about marriage system in future dragon ball games...still doubt that will ever happen, but again, it's an idea, cute and all...perhaps not in an mmo, but in a solo adventure-like game, not an expert so i wouldn't know for sure.
And pretty sure the two unnecessarily rude responses you got already showed what a lot of people think about it, so better leave it for another game, since including such concept to the game would just make people more mad, cause arguments and other possible negativity.
you mean skyrim lmao