Some of the earliest f16s egypt has are now 40 to 42 years old. They are bound to get replaced by something very soon.
Mig29 and rafales seem to have replaced the myriad of older j7/mirage jets.
If anything, the su35 deal was possibly there to replace the earliest f16.
In addition to f16, which will need replacment in huge numbers going forward, 40 airframes asap and 40 more by the end of the decade, there might be an issue with mig29.
Sure they are new but reportedly the influx of replacment parts from russia has been an issue due to ongoing caatsa pressure. Its plausible that egypt might decide to divest itself of the migs at some point, if the alleged maintenance woes are true.