Might want to cycle through them, but treat the unworn pairs really gently for the first few wears. Msybe they'll still be ok.

Rubber gets brittle if it isn't kept supple through flexing. The rest of the shoe last longer if given time to 'rest' from over-stretching or dry from sweat.

So if you have multiple pairs of shoes, cycle through wearing them. All your pairs will last quite a bit longer: you'll keep the rubber supple, and you'll rest the sock/upper.