They have never stopped. The F-15K is still being built. A good question would be to look at a new production model incorporating the F-22 systems, engines and maneuverable thrust. It would likely come out superior to the SU-30 and Eurofighter. It still wouldn't be the F-22, but it could be much more affordable, and add more strike capability to boot.
“A good question would be to look at a new production model incorporating the F-22 systems, engines and maneuverable thrust”
You wouldn’t even have to do that. Just take the current F-15E/K production line, build a single seat F model optimized for air superiority again with AESA radar and an engine like a GE F414. You could probably even make it fly-by-wire with minimum trouble. It would cost about the same as current Eagles....about $50 million apiece off the line. At those prices we could buy almost 3 planes for every Raptor.