No. If you were to keep expanding the sampling frequency, even without adding any more information to the signal, then that would correspond to N getting larger and larger. The limit of increasing N is N -> infinity. But limit(fft(x,N)/N, N->infinity) is going to be 0 (provided that x is not a constant spectrum.) So you are asking if 0 (limit of discrete) is going to be the same as division of the continuous time signal (infinitely dense) by the OFDM symbol time (time of a bit of information contained in the signal), which is obviously not going to be the case (unless T itself approaches infinity.)
You need to distinguish between sampling frequency needed for correct analysis (Nyquist frequency) and sampling frequency of the A/D convertor: your formula should not tend to 0 as the actual sampling frequency increases beyond the minimum necessary to decode the data properly.
