User blog comment:BlindmelonKen/Could Arrow tie into the DC Cinematic Universe?/@comment-10822184-20130613214537/@comment-5574752-20130824004832

This a very unlikely situation. As bloody epic as is would be to see Stephen in the JL movie this is 99% not happening.

Agents of S.H.I.E.L.D was set into production after the avengers line was started.