it would be really good if KSA can get along with Turkey through some kind of major deal like that. but i think, this is unlikely.I am not saying they will place a 100-200 order tomorrow. However, over the timespan of the partnership they will operate TF-X in that magnitude. Remember, KSA wants to keep a strong air force with many 5th gen fighters and they are not getting that from the US.
And it is also hard to estimate what would geopolitical landscape going to like one decade later.
let TFX meet the Turkish air forces requirement first, then we will see how it does on the export front.