Semi-recessed Missles

how much drag and RCS is reduced from semi-recessed missles?

So far the only aircraft that have semi-recessed missles are..
Tornado ADV, Eurofighter, and MiG-31. it would look like much drag and RCS would be reduced..

I was thinking, should a future stealth aircraft feature some semi recessed missles? perhaps 4 medium range AAMs outside which gives more room inside for A2G stores. I figure this would not compromise too much stealth and drag.