We revisit the theory by Eggers [Phys. Rev. Lett., vol. 93, pp 094502, 2004] of the critical capillary number for the Landau-Levich-Derjaguin forced dewetting transition. We generalize this prediction to large contact angles and arbitrary viscosity ratios and express the critical capillary number as a function of the imposed contact angle in the numerical framework and a characteristic length scale, related to the numerical slip length, that correspond to the microscopic contact angle and the microscopic length scale in the Cox's theory of dynamic contact lines. We validate our predictions with the numerical results.