Very unlikely that it happens! I believe americans and iranians will not go to war. However, we will for a period witness a threatening rhetoric from America, Iran and Israel and after some time this hysteria will fizzle out!
Those military bases were also host to other nationalities and all of them including the iraqis have denied any casuality. So it seems like Iran warned abt the attacks as reported and all forces evacuated the bases, hence no casualities.