  In this paper we discuss a well known QCD result: the steep increase of
Green's function for exchange of $n$ BFKL Pomerons $G_{n \pom}\Lb Y\Rb\propto
\exp\Lb \frac{n^2}{N^2_c} \Delta_{\mbox{\tiny BFKL}} Y\Rb$ where $N_c $ is the
number of colours ,Y is the rapidity and $\Delta_{\mbox{\tiny BFKL}}$ is the
intercept of the BFKL Pomeron. We consider this problem in the framework of the
simple Pomeon models in zero transverse dimensions, which have two advantages
:(i) they allow to take into account all shadowing corrections, including the
summation of the Pomeron loops and (ii) they have the same as in QCD striking
increase of $G_{n \pom}\Lb Y\Rb $. We found that the strength of shadowing
corrections is not enough to stop the increase of the scattering amplitude with
energy in contradiction to the unitarity constraints. Hence, our answer to the
question in the title is positive.We believe that we need to search an approach
beyond of the BFKL Pomeron calculus to treat $1/N_c$ corrections in Colour
Glass Condensate effective theory.
