S400s were ultimately an excuse; they're also definitely vulnerable, as are any single digit assets - they aren't death stars (though TAF now has capability to cover them, unlike Iran). They're also still the only hidden (literally now) card that can be played to survive until IADS and Sipers fully establish themselves
Turkey is a vast country, roughly the size of France and Germany combined, so it will take at least a decade for the layered AD to be fully established. Technically however, Sipers are already in place. Currently, there are 5 batteries in service, and annual production stands at 3 Sipers, 2–3 Hisar-As, and 6–8 Hisar-O+/RF. FYI, Siper output is set to double next year with a new production facility. Even now, only a handful of countries can match this production scale, although it will continue meeting yesterday's urgent needs for quite some time.
The two S-400 batteries aren't worth shit since even now they're not deployed; nor are they integrated into the national radar network (Standalone mode) or can be deployed to Turkey's overseas bases.
I share your view on the Gulf Typhoons. However, somewhat surprisingly some insiders say we shouldn’t be too concerned. Even though the situation is opaque right now, Qatari F-15s are doing most of the heavy lifting, not the Eurofighters. Omani EFs also haven’t been maintained for some time - which is why they’re being sold - so they’re not active either.
The first six “fighter-adjacent” Kizilelmas are about to enter service soon, equipped with GaN FCRs no less. Even if the first two years are spent on AF evaluation/feedback, training and IOC; by that point roughly two squadrons of Kizilelmas could be raised. On their own that wouldn’t be enough, but when paired with the Eurofighters they could meet the urgent requirement.
Integration of the MURAD-100A across the entire F-16B30/40M/50M fleet (~200 aircraft) is also set to begin next year, and the reported monthly delivery rate is surprisingly impressive. (The delivery phase is planned for two years and we’ve heard nothing but positive news so far, so you can guesstimate the scale yourself)
We are also confident that Kaan B10 will keep to the timeline and enter service by early 2029 at the latest (IOC ~2031), considering the IWBs will be software-blocked until fully certified.