Yes, a shame really. As much as I'd appreciate a Harima x Yakumo, (but I won't deny a Eri x Harima), I wouldn't go as far as to wish Yakumo to 'be' more like her sister since its akin to wishing to de-evolve from a superior to an inferior form just to attract someone. Therefore, no chances of Harima shifting focus from sisters by natural consideration of similar 'attractive' qualities shared by siblings (think: ' if one is unattainable at least the other is just as good ' ). Maybe Harima will eventually be charmed by Yakumo due to her own merits :P. I mean, if his original crush is Tenma, then moving on to Yakumo can only improve his standards, poor guy XD.
On another note, yay for chap 40b!! I hope Akira was being more 'insightful' rather than being humorous using that folk tale to compare Yakumo and Harima.