I'm with Jedi on this.
Study level planes all fine and dandy - I did enjoy learning the A-10C but in all honesty, I never fly it nowadays.

I think more money and more pilots would show up if they crafted some FC3 plane packs.

Imagine early/mid/late cold war era packs such as:

Sukhoi Strikers: Su7/Su17/Su25
Sukhoi Fighters: Su9/Su15/Su27
SAAB Pack: Draken/Viggen/Gripen
Euro Pack: F104/F5/F16A
USAF Pack: F4E/F16/F22
Navy Pack: F4S/F14/FA18
Navy Strike: A4E/A7E/A6E

or role packs:
MiG Pack: MiG21/MiG23/MiG25
Russian AF: MiG29/Su27/MiG31


or since many of them lived through some major upgrades even family sets would be possible:

Fishbed pack
MiG21PF, MiG21MF, MiG21bis

Phantom packs
USAF F4C, F4E, F4G
Navy F4B, F4N, F4S
RAF F4K, F4M, F4J
Euro F4F(LW), F4E(HAF), F4E(TAF)

Draken pack
J35B, J35F, F35J

With such packs the multiplayer hooligans could join any "era server" flying their Fishbed of simulated era - no problem joining.

Today you need to survive in your 21bis in a Eagle spamraam environment (ok, server host could limit to Sparrows - but does it happen besides 51st?)

$30 each pack if fc3+ modelled, fair price?
$50 for opponent bundle, say one F4-pack with a 21-pack.

All with minimum 1 campaign included.