I'm not too worried about the satellites that serve the US/Canadian markets as the services will move to the remaining part of the C-Band spectrum. Sure some will go to IP instead but like Brian said, IP does not necessarily make sense in all cases and satellite is still a viable solution. There's also the option of moving to Ku. Sure there's rain fade, but if it's good enough for the PBS mux, it must be reliable enough for others too.
my biggest worry is that C-Band satellite services will continue like they are now on Atlantic satellites, and that we will no longer be able to receive parts of them because of terrestrial interference from 5G.