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Michel Bastos and Alessandro Florenzi aren't natural forwards, so it would be a little disingenuous to suggest that Roma's substitutions in games like this lack quality. Florenzi, in particular, brings the kind of energy and industry that are crucial in closing out a game comfortably.
That said, had the Giallorossi needed to chase a result, they'd have been a little short on options if something happened to Mattia Destro or Francesco Totti. Adem Ljajic and Federico Ricci were the only other forwards in the squad, and the latter in particular needs a lot more experience before he can be relied upon to change a game.
Even Gervinho, who's been excellent this term, is not at his best in front of goal. The Ivorian is most effective farther back, when he can use his pace to burst into space and spearhead his team's attacks. He's neither a lethal finisher or a real threat in the box.