Again, if air superiority is a huge issue for both sides, heavily armored, low flying aircraft could have a window to operate in. SAM would have an easier time in fact targeting higher flying interceptors than low flying A-10s.
And I know that SAM crews during war relocate but SEAD can be conducted (and probably is when neccessary) not as a standalone mission but as an escort mission. Moving every hour won't do it. The instant the targeting radar is turned on at a distance meaningful in engaging the incoming aircraft, the HARM system on the Wild Weasel birds will pick it up and a lot of hurt will be on the way.
Of course, consequent SEAD will have result, even more, in selected sector of front line it is quite possible to concentrate a lot of aircraft and numeral superiority. Besides, `Shilka` type mobile AA systems, which is main threat for low-flying A-10, also can be take out by artillery, ATGM or saboteurs. But - all this depends from creativeness of high command, of means what command have and many other factors. And this is the mistake of Clancy - nobody did not forbid him to describe all in this manner, not just `A-10 freely flying over battlefield and one by one destroy battalions of Soviet tanks`.
Plus you are assuming that Russian and American Air capability is the same, which it is not. American air capability trumps Russian capability in almost every category.
I guess we do not have today exact info on how many aircraft did have USSR and USA in mid-80-ies. For today (±few years), Russia have:
Bombers:
- 28 Airforce Tu-160;
- 100 Airforce + 140 Navy Tu-22M;
- 43 Airfoce Tu-95;
- 87 Airforce Tu-95SM;
- 500 Airforce + 100 Navy Su-24.
Fighters:
- 450 Airforce + 35 Navy MiG-29;
- 150 Airforce + 200 Air defence + 30 NAvy Su-27;
- 250 Airfoce MiG-27*;
- 300 Airfoce + 250 Air defence MiG-23*;
- 130 Airforce Su-22*;
- 30 Airforce + 320 Air defence MiG-31;
- 20 Airforce + 180 Air defence MiG-25;
- 20 Navy Su-33;
- 90 Navy Su-17*;
(*Wikki claims as `retired`).
Ground-attack:
- 250 Airforce + 7 Navy Su-25.
AWACS:
- 15 A-50 `Mainstay`.
USA have:
Bombers:
- 21 Airforce B-2A;
- 92 Airforce B-1B;
- 94 Airforce B-52H;
Fighters:
- 957 Airforce + 13 USMC Reserve F-15;
- 2 724 Airforce F-16;
- 195 Navy + 14 Navy Reserve F-14 (in process of retirement);
- 226 Navy + 36 Navy Reserve + 211 USMC + 48 USMC Reserve F/A-18;
Ground attack:
- 52 Airforce F-117;
- 336 Airforce A-10;
AWACS:
- 33 Airforce E-3C;
- 63 Navy + 11 Navy Reserve E-2C.
(Source:
http://www.topgun.rin.ru/cgi-bin/texts.pl?category=state&mode=select&lng=eng, I used Russian version since I read and write Russian better than English)
Let's sum its up. So, result is:
Airforce, US (airforce + USMC) vs. Russia (airforce + air defense):
Bombers: 207 vs. 758
Fighters: 3953 vs. 2280
Ground attack: 388 vs. 250
AWACS: 33 vs 15
Navy, US vs. Russia:
Bombers: 0 vs. 240
Fighters: 471 vs. 175
Ground attack: 0 vs 7
AWACS: 74 vs. 0
Apparently I did not count ALL the aircraft, besides I do not know exactly how far there is retirement of old aircraft in both countries; I am not sure how to classify F-117, too - it is nor fighter nor real bomber. But I think you are right - US has considerable superiority in number of fighters (almost 2x, if claims of retirement of MiG-23/27 and Su-17/22 are true, then superiority is even greater). Superiority in bombers of Russia is made by Su-24, which is front bomber (strike aircraft).