There is going to be a greate deal of pain of the dull ache variety and the continued slow deterioration if England does not make the break rapidly because the Brexit will be stymied and England will be tied much more tightly to EU. The best calculated solution is not available. The politicians are almost universally determined to stay in EU and will use the delay to make it happen.
That's simply not true. Some will, certainly, but not all and not the majority. Remember that the minister in charge of Brexit is David Davis, a lifelong Europhobe who's been unflagging in his public determination to get out of the EU ever since he became an MP. Likewise Liam Fox, who is responsible for negotiating the new trade agreements. It was because of continuous pressure from them and other like-minded Tories that Cameron called the referendum in the first place.
As for the majority - just because the majority of MPs were 'remainers' before the referendum doesn't mean they will try to block the will of the people now. On the contrary, the will of the people will be respected, but there will be close Parliamentary scrutiny of the detail, as is constitutionally proper. One of the main themes of the Brexit campaign was the repatriation of lost sovereignty from Brussels to the Westminster Parliament. It would be a bit perverse for those who campaigned on that basis to object to the exercise of that sovereignty by Parlilament now.