Honestly, yes. Well maybe... and maybe not...
If recent releases like Comedian has taught me anything it's this; Pretty much anything other than a standard doll with fabric clothes (i.e. rubber bodies/costumes, skins etc.) will eventually deteriorate.
It seems to me the webbing is some sort of rubber... plus its just so thin that in a years time i think we will see the first signs of cracking/rotting on the webbing.
Will the suit stretch? maybe not actually... but leaving it in dynamic poses could be a problem.
IMO the scariest thing with this figure is that there is no way to get the suit off... meaning you leave him crouching for 3 months, you change his pose SNAP his knee breaks off and you are screwed.
The washers in the knees specifically are made out of a rubber.. when its bent in any way it stretches that rubber, and in time the rubber always rots. I had two different godfather knees snap from his sitting position. Only with that figure its no big deal as you simply swap it with a truetype knee..
with spiderman... how are you gonna get that knee out of the pants?
My advice, pose him, take pictures and have fun but when you're done, put him in a decent looking vanilla pose and forget about it... it's not worth accelerating the deterioration time, with a figure like this, is inevitable anyway