Meretz is in the shape it is because whilst the left is alive and well in Israel look at Kadima. Being a left wing party doesn't mean you have to agree to every single demand the arabs make. The left are not in government right now the majority on the left do now want the far left just same as the majority on the right do not want the far right. There are extremes on both sides and they have always been a much smaller sect that the centre. Israelis have grown up since the days when the far left had any substantial support and today people want more than the peace process and other far left ideas. If you want a Meretz like state thats always going to be there then go find a dictatorship which will impose far left policies. If you want democracy accept that different people will want different things from their government at different times. Also don't forget there are two sides to this conflict and if arabs don't show enough support for peace the peace camp will loose their support.
from the article: There has never been an Israeli peace camp