The longer Boris stops on the better chance Labour have of winning the next election. Labour call for his resignation now, but only to strongly emphasize to the floating voter that he and his close circle are a bunch of Hurrah Henry's who, unlike previous leaders, are even incapable of keeping their disdain for the Average Joe behind closed doors.
If they all buggered off to somebodies private country gaff or swanky studio flat to indulge in these parties there still would have been outrage no doubt. But to have these sneaky do's at 10 Downing Street also makes you question whether these people have the right mentality to help run the country. They either couldnt give a **** or are as thick as ****.........or probably both!
If Boris's and his close bunch of loony's are chucked overboard today and are replaced by a more stable unit to steady the ship, that would be disastrous for Labour. Thats why he is losing support from even some of his allies. They want him out now. They can no longer afford him and their party to continue stumbling from one scandal to another towards the next election.
Although they also have to consider the fact that there's nobody who connects to the electorate like him, and it looks like there's only crackpots to replace him. The gamble is whether it's worth keeping him and hoping voters see all this as ancient history come election time. What it's definitely done is ensure the next election won't be along shortly, it'll be the last possible day.