I think so too. I'd rather keep Nocerino and give Marchisio more chances. Even wage-wise, this is better, and we rather use the money on a proper attacking midfielder/winger.
Flamini is good, but where will Marchisio go then? Having a midfield of Flamini, Sissoko, Zanetti, Marchisio (and maybe even one of Nocerino/Tiago) gives him very little space.