Some of the Americans starting to leave now are not even waiting their 3 months. It makes sense since the U.S. airlines are hiring between 75-100 pilots a month. One waits 2 extra months and you are potentially 200 numbers junior. Over 25-30 years and that is huge.
Emirates being Emirates charges the pilots leaving $25,000 but you will be far better off leaving Emirates and starting your career in the US working for a good airline. One Emirates pilot even left for Jet Blue. Shocking but he was on the 330.