With an additional 40 years of life added to each cable you inject, is it possible to run out of injectable cable?
There are over two billion feet of pre-1985 vintage polymeric cables still in service in North America. Stranded cables with strand-block, whether direct buried or in duct, can be rejuvenated for a fraction of the cost to replace. I am going to be busy for some time, just getting caught up on that back-log. In the mean time humans keep installing new cables and they will start to fail someday too. The next generation will have to deal with the newer ones.