camilo1,
Realistically the total number of L-1011's that could be put back in service is quite low. They would all have to be RB-211-524 powered versions, the -200's, -250's or -500's. The other models used RB-211-22B's and they are no longer supported.
Less than 70 of these airframe exist and many of them have been in storage for many years and their overall condition has to be suspect. Some of these the 9 RAF airframes, the 3 VIP configured aircraft are not suitable for commerical use.