After her network dropped her show, streaming services dropped her reruns, and her agency dropped her for a racist tweet, Roseanne Barr is vowing she's not finished.Whether anyone will have her is an open question.Mainstream television, where she saw soaring success both on the original Roseanne and the recent short-lived reboot, is probably out. But she finds herself in an environment flush with media outlets where the style of incendiary statements she was making long before Tuesday's tweet is not a hindrance, but rather an asset.Adam Rose/ABC"Whether or not she will see herself back on