The question is not what it can contribute, but what it is prepared to contribute. And if the mentioned incident is anything to go by, Egypt's contribution is of a far reaching destabilising nature.
Morsi came to power through free and fair elections.
His election ended the Mubarak (Dictator) chapter in Egypt's history.
With his statements on Syria he just shows, that Egypt wants to stand on the right side of history.
Nothing "destabilizing in nature".
What's your problem?
His problem is he sees everything through his hate-for-America prism which, as most rational people know, can be very narrow, depending on how you hold it.