Looking at Lyngsat launches for 2019-2021 I don't see a single satellite launch for North America replacement.
That's probably more of an indictment of Lyngsat's list than it is a telltale. It is also important to remember that modern communications satellites are lasting 10-15 years so they don't need to be replaced as often. If you look back ten years, the recession hit and many satellite orders were put on hold or delayed. This may have induced a cycle into the deployment of satellites that will come around in a few years.
As MPEG2 (and, heaven forbid, analog) uplinks are replaced with newer technologies, the requirement for bandwidth goes down significantly.
So many launches are happening at new sites and via relatively new delivery services that it can be difficult to keep track of them all.
The greater danger to FTA is more and more properties being encrypted to ensure that the content providers get paid for what they deliver.