Yuu x Touko is the endgame of the series so am not too worried. But I also want Sayaka to be happy as well & stay best friend's with Touko even after her confession.
Am hoping Nakatani sensei is planing on having Sayaka fall in love with another girl that love's her back. And am also hoping she's planning on having that free-spirited girl from the light novel about Sayaka's past show up in the mainseries, cause that girl actually had feelings for Sayaka, unlike that senpai that used Sayaka as an outlet.
I think that Nakatani sensei has a plan to have Sayaka have her own happiness in the series too just as much as she does for Yuu & Touko.