Hamas does not appear to feel under pressure.

While the protests are unprecedented, Hamas does not seem open to concessions.
In addition, the Arab states do not seem to be welcoming this opportunity for leadership change in Gaza.

Why are so few countries involved in working with the protesters or leveraging them?
Many countries likely fear the street power of protesters more than they fear Hamas.

They are all too busy, too focused on Israel, taking them to task over everything they do or don't do... and letting the terrorists, off the hook

Countries such as Egypt have been accommodating to Hamas over the last several years. Countries such as Jordan may back the Palestinian Authority
But they don’t want protesters in their own country getting any ideas.

Many countries:
1. saw the success of the Syrian revolution
2. and how it led to the fall of the Assad regime — with Israel's help though
3. and they don’t want to end up like Bashar al-Assad.