I skipped past lot of discussion (i.e just read your reply here and some others very briefly)....so sorry if some of this already talked about...
Are the Su-25 rumours really true though (likely to pan out etc)?
Or its part of some rumour mill thing for pressure generation etc?
Frogfoots make sense if you got them/inherited them cheap from USSR breakup.
Otherwise their MRO, weapons logistics for NATO/western-centric system country is going to be a unnecessary toll (dont let "compatibility" fool you too much).
Keep that stuff in hurjet, heli and UAV projects (esp network sensoring between these) for CAS.
A CAS hurjet variant is probably ideal if you need dedicated platform.
I remember long discussion I had many years back with retired USAF guy....and he told me yes in media there is lot of support for retaining A-10....but certain things have move deeply in CAS capability by sensoring that F-35 can do in that role.
Consider that this is A-10 which is far superior in every way to frogfoot.
Consider also the production has stopped:
A Russian official has announced that production of the Su-25 ground attack aircraft has stopped. Russia’s Industry and Trade Minister, Denis Manturov, announced on February 7, 2017 that the Russian …
dsm.forecastinternational.com
So where is turkey (hypothetically) planning to acquire the airframes, and how old are they? (this re-inserts into MRO costs and availability impact).
Hurjet-CAS is way to go. Is the interim requirement really that severe till its ready?