Though the questions you have asked are from @The SC.But what is the story with the 64 total? While I have no problem with that at all and hope it comes to fruition, but was that on Arab Defense? Add those to the 54 - 72 Rafales and 52 MiG-35s and eventually the 30 + XX Su-57 and 200 F-16s and I would say that the EAF would hold up against the majority of anyone around the area. BTW, I'm surprised they haven't increased the number of the MiG-35s unless they're waiting for the AESA radar because right now, that would be the BEST aircraft for them to increase it's numbers in large quantities considering the price, even without the AESA and the Zhuk-ME. They seem to be very happy with that aircraft so I say bring that total to 100 by adding the same amount as the original order of 52.
IMO to understand EAF replacement of old aircraft we must identify the most important change that has come due to the introduction of F-35 with IDF.
Egyptian F-16's are toothless hence EAF needs to find appropriate replacements within similar time as they need to replace old aircraft like the Mig-21 and Mirage 3/5. For this very reason EAF needs at least 250-300 aircraft within the next 3-5 years with BVR capability. So a mix fleet of both Eastern and Western fighter aircraft that are non US has been selected. The effect of this was seen by President Trump as he rightly offered upgrade package for 100 F-16's yet that did not offer any advance BVR missile though would have given EAF adequate areal deniability WWR. However this offer is yet to be accepted by EAF as this would be a huge amount at the end for a very limited aircraft. The package of upgradation of 100 F-16's would be around 6 billion USD add this to the remaining F-16's would increase it to around 10-12 billion USD spread around 4-5 years.
With an amount of 10-12 billion USD the F-16's can be replaced completely by a modern aircraft that has good BVR capability within the same time frame of the upgraded F-16's. So currently options are being carefully looked at by the EAF.
Personally selling the F-16's and Mirage 2000's would generate an other 6-8 billion USD enough to buy 50-60 Rafales. 110-120 Rafales at the end of the day is safer option against the F-35's. Now add the 5-6 billion USD saved from the initial upgrade program of 100 F-16's to order 60-70 Euro Fighter Typhon. This would give EAF approximately 90-100 aircraft.
EAF would still have 5-6 billion USD to spend on SU-35 and Mig-35 from the remaining 100-116 F-16 upgrade. This amount should be enough for an other 100 odd mix fleet of Mig's and Su 35's.