I am more worried about something else actually.
It's Oda pulling something to portray shanks stronger than Mihawk regardless of the title.
I don't know why but I feel Oda might pull it off for real.
Luffy's strongest attack beat Kaidou's strongest attack (beating the WSC strongest title holder). WSC also defeated 7-8 times.
WSM literally says he can't be the strongest forever.
Loki, a guy with no strongest title, is portrayed to be significantly stronger than a guy on the level of Xebec, a superior of WSM and WSC.
Imu and Joy Boy, the candidates for the strongest being in the world ever, don't have strongest title.
So i'd think WSS title is not safe either. Shanks has been called Destiny's Child, Oda has dressed as him, oneshot Kidd + Killer, Kaidou's vision showed him as one of the top guys in the world, Shanks' CoC is compared to Joy Boy (the HIM himself) while Mihawk is even yet to show a speck of CoC, ran from random marines, stalemated against Vista, not shown in Kaidou's vision of top guys in the world, etc