An "expert" of status comparable to Ras, stated a few days ago this was the last election to feature conventional, traditional polling as we have come to know it.
He says the stable, land line era is over, and pollsters attempts to keep up to date with changing technology, individual lifestyles, etc. is over.
I don't completely buy that. Increasingly all phone numbers are stable, as people change providers, but keep the same number, including porting landline numbers to cellular or internet services.