Boeing 737 MAX aircraft fleet is grounded for required fixes and will be cleared for flights in this year. In case you didn't knew, small (low-cost) passenger aircraft are in very high demand worldwide. Large (high-tech) passenger aircraft such as Boeing 777x and Airbus A380 do not have many takers out there.
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F-15SE Silent Eagle was cancelled because it would have undermined sales of F-35 variants - a project in which Pentagon have invested a great sum. Israel was really interested in the former option but was outright refused. However, Israel was chill because it was getting F-35A regardless.
US will not offer F-35 variants to every friendly country out there though. However, US might offer F-15SE Silent Eagle or a similar solution to some friendly countries. Depends upon who is willing to negotiate for it.
The aircraft in question is beautiful and beastly. Boeing showcased an advanced prototype a few years ago, and finalization will not take much time.