I would like to revive this thread because I have the same problem, but for different reasons. For me, there just isn't a girl that I…"like" enough over. Here are all of the girls that come closest to being "waifu" material for me:
<Mana (From Yu-Gi-Oh!, first "potential waifu"): I obsessed over her for a little while after finishing off watching the original Yu-Gi-Oh!, but that ended pretty quickly after a month.
<'Blaze (From the SoT series)': I really like here, but I do not know why. I always try playing as her whenever I can, but I don't really pay attention to her personality (I actually find it a bit annoying, partially because she isn't able to "grow" due to story reasons).
<Lamia (From Id: The Greatest Fusion Fantasy, third pic is how she appears when she's able to give herself an appearance, but she's really a sword (Fourth pic)): I just really like her personality. However, I also want to see her "win" in the end by getting Id. So, that's off the table.
<Sunset Shimmer (From MLP: Equestria Girls): I like her look, I like her attitude, I'm a sucker of reasonable stories where the character goes from being genuinely evil to a "good guy" and fixing their past mistakes, but…it doesn't quite "hurt" enough to see her attached to a shit series.