It's harder rolling a PM then an Opposition Leader so i can see Billy holding on the full term, the next election due in 1977.
No Dismissal is an interesting consequence of this.
Also by 1977 the Libs/Country have been in power Federally for 26 out of 28 years. The Australian people will be less used to a Labor Federal Government then they were with an extra year of Whitlam.
Force of habit and inertia will help the Liberals in '77.
Despite the Australian left post-Thatcherism lionising Whitlam, *at the time* they were bitterly opposed to him for being middle-class, not socialist and too "right wing". It's reminiscent of the modern claims by the Trots in the universities and the Greens that the ALP is '"centre-right".