Barak is the most uncompromising defender of the Occupation and settlement expansion in the whole cabinet. He split the Labor Party, the party that CREATED Israel, just to keep the defense minister's job he appears to believe is his by divine right.
Barak as pm would be a nightmare.
The only chance there is for any change is for the whole pro-death right-wing coalition government that currently runs Israel to be decisively voted out at the next election. The hawks and the haters and the settler-enablers have nothing to offer Israel anymore.