Non-Gaming girls are fine to date/marry as a gamer...it's the ones that don't have an understanding of boundaries, space or that what someone is doing may actually be important.

My last non-gamer g/f ended with a breakup over Everquest. I was guildleader of #2/3 guild on our server and we'd planned a progression night to kill Rallos Zek in Plane of Power expansion, we'd been working on him for about 2 days and knew that this was the night (had had this week booked out for about a fortnight on forums to make sure everyone was there and prepped)....about an hour into the raid we'd gotten him to < 50% and my g/f turns up with no call or anything, walks in to my place, goes to the bedroom, gets undressed and hops into bed (at this stage we'd been together a few months).

I explain to her that I currently have ~50 people relying on me and expecting me to be there and I can't just drop things because she decided she wanted to turn up, that I shouldn't be too much longer but it could also take a few hours. Six hours later RZ was dead and g/f was running out of my place in tears....I made the right choice given the way things finally ended (think I can say I'm the first non-celebrity male to be stalked for over a year)

Things didn't go badly here because she wasn't a gamer, things went badly because she has a constant "victim" mentality and only ever looked at things from her perspective. If you want to find someone for long term, both of you need to be able to respect and understand that the other may have hobbies you think weird or strange but be willing to respect what they need while they are involved in them as much as you'd expect them to respect your needs at the time.