I don't think the stickiness is what makes the process work (collodion does have to remain somewhat wet to make the process work).
The chemical reaction is as follows: The salts in the collodion form into silver halide sesitive to light when they come into contact with silver nitrate. After plate exposure it is normal dev/fix processes.
By replacing collodion with gelatin one can sensitize a gelatin+salts plate in the same way and use it whenever he likes without the rush before everything dries up. I think that some addition of chrome alum might be needed to make sure none of the gelatin melts during the process when submerged in any solution.