I am 100% sure it will be copied for the other A3 models
....I assume you mean it will be copied and adapted by aftermarket manufacturers to fit other A3 models. Tracking etc is different on the RS3 so I doubt it could be copied absolutely exactly. However, it could have a very similar appearance.
But so what? It wouldn't stop me wanting to buy a RS3. Afterall, there's quite a few folks who have fitted Mk5 GTI fronts on their Golf diseasals etc and it doesn't bother me but there's no way I'd do it!