The government has indeed "implemented the last one" . For almost three years they have been treating the result of that referendum as an instruction, whereas it was, in law, only advice.
They have done everything possible to find a way of delivering the unreal undeliverable promises of the cake-and-eat-it leave campaigners and to try to square the circle of the Irish border.
They have now proved conclusively that it cannot be done. Any brexit would harm the country, make us all (or nearly all) poorer, endanger our security and reduce us to a third-rate nation scrabbling around the world for trading partners who might allow us to trade on their terms. We've all had enough of that implementation.