To the OP: we only have a few subspecialties listed and these are the most popular (ie, PRS, ENT, Ortho, and Neuro). We don't have any others or fellowship programs because there isn't enough traffic to justify it and we haven't made a commitment at SDN to focus on that area (ie, fellowships). It is difficult enough to find residency moderators, let alone fellowship ones.
As you can see the statement "CT is dying" is a very contentious one and one that is not likely true. The practice of CTS has changed and will likely to continue to do so, but a large number of CT surgeons are nearing retirement age and we will have to replace at least a certain proportion of them.
Thoracic specialists do exist and it too has changed somewhat with fewer resections for lung ca, but there is still a fair bit of work, especially for congenital anomalies (although this may be deferred to pediatric surgeons who feel confident in the chest), penetrating trauma, esophageal cases, etc.
Because of the relationship with cardiac surgery, thoracic by itself is not very competitive, but that may change in a few years as the cycle renews itself and others are willing to transform themselves and the field.