Napoleon defeated this alliace a few times, and I didn't see the UK giving up that much...
Prussia stayed out of the Revolutionnary wars from Valmy in 1792 until its disaster of 1806. And it wait until 1813 to engage again French forces...
Russia was a relunctant austrian ally, when for example, Russia withdrawn from Italy and Switzerland in 1800, or when Russia don't help Austria in 1809...
In 1800, France fought against Austria and some minors germans states.
In 1805, France fought against Austria and Russia.
In 1806, France crushed Prussia and Saxony.
In 1807, France defeated Russia and what left of Prussia armies.
In 1809, France defeated Austria.
In my opinion, in 1812-1813, an alliance of a reformed Austria and Prussia and of all of Russia could be a worthy opponent to a Grand Armée not decimated by the Spanish Campaign or the war of 1809.
I don't think Napoleon will left Prussia or Austria being able to rise again and they will lost a lot of territories to a bigger Duchy of Warsaw or even an independant Hungary or Croatia...