Who is gonna target the saudis or any GCC member in that case?
Nobody dares to target them unless it is all out war between them and whomever it is. The Saudis and GCC policy is simple to understand if other people want to go to war fine but just don´t include me and keep your wars over there.
GCC and SAUDI could absolutely flatline Iran if provacations were to come to shove they have larger airforce then Israel and have the one thing that is threat against Iran which is manpower and regional allies If the SAUDIS join in on a conflict against Iran then Iran will get invaded but the US and Israel can´t without the GCC.
Where are the Americans gonna attack from is the question? they need land-corridor the question is who is gonna open that land-corridor it will only be possible If Iran only unfriends the Saudis then the corridor will open this time not for empty strikes but an actual ground invasion from Pakistan, Hormuz, Thru Iraq, Kuwait, Turkey and Azerbaijan.
As a matter fact the Saudis are the only thing standing against Iran being invaded and a lifeline after they have normalized and the only entity keeping a ground invasion on Iran at bay thru their influence.