The Palestine Question

The problem with the two-state solution is that it never was two states:it is one state superimposed on top of another like a palimpsest.

True that it is one imposed on the top of another. Well almost, up until the settlement of Palestine by the definitive Balfour Declaration (big assumption I realise). However, an attempt to restore the past is a flawed pursuit. Given the intervening history it would be unattainable. We now have to disregard the past in order to attain a desirable future.

The ideal must surely be a one-state solution, where citizenship is based neither on ethnicity nor on religion.
That would be an ideal, but it isn't going to happen. At present ethnicity and religion is far to deeply ingrained into both sets of national identity to allow this to happen. A future integration might be possible but at the moment the two state solution is the one that is needed to preserve the nessecary rights of both sides without the use of extranational occupation.

I believe that the two-state solution is never going to happen – it has become a means for politicians to pay lip-service to the Palestinians while doing absolutely fuck all.

Just because it has become a means to lip-service, doesn't mean it can't be attained. We just need to move from politicians doing fuck all to doing something. The usual slurs about politicians are bound to follow but ultimately they still actually do things. Afterall Balfour was a politician and he made a declaration that was quite meaningful apparently.