Revolutions...
It seems almost a feature of revolutions they have to survive what appears to be an overwhelming external and internal threat. The French Revolutionaries faced a similar crisis in 1792-94.
Were the Whites ever realistically close to victory ? It would have required more competent and unifying characters than the likes of Kolchak and Wrangel to achieve victory and the anti-Bolkshevik elements on the Left (the Mensheviks, Left SRs and the like) were too weak to pose a serious threat to Lenin and Trotsky.
The best the Whites can hope for is success through accidental co-ordination. As Kolchak's forces advance from the east, the Left rises in Moscow and this, combined with a more militarily successful push, leads to a collapse in the Bolshevik front in October 1918 allowing Kolchak to reach Moscow and proclaim his All-Russian Government.
Forced back to Petrograd, the Bolsheviks are now assailed on all sides with armies closing from the east and the south and the citizens revolting (as it were). Lenin and Trotsky flee as the Bolsheviks collapse into anarchy and Petrograd surrenders to the All-Russian Government on December 15th 1918.
The problem for Kolchak is can he unify such a disparate coalition - the immediate answer seems to be no and Russia descends into a prolonged period of anarchy and low-level civil war from which the newly-independent Estonia, Latvia, Lithuania, Belorussia and Ukraine will emerge in the early 1920s.
Longer-term, with chaos to the east and a recovering Germany to their west, the newly-independent states look to Poland as their protector backed with the new Franco-Polish Alliance of 1925.