This might surprise some, but I support the marriage. The only thing that I don't like is
how they got married, but thankfully we don't have to dwell on that.
Character growth is a Good Thing™, and I'm all for it, as some here have no doubt noticed. To have them left nigh on forever as two people who fancy each other without building on that at all would be poor story-telling.
After all, I can't hate the stagnant reverse-Guybrush of CMI and support another form of character stagnancy, if I'm anything it's consistent.

So yes, it's good that they're married and a good writer could have a lot of fun with their married status, I'd think.
They might even end up with a kid, and that'd be hilarious. Here's a fun question; what would someone named Guybrush Threepwood call his kid?