Noah Emmerich will replace Brian F. O’Byrne in the Kennedy Center’s upcoming production of “A Streetcar Named Desire.”The Tennessee Williams revival goes into rehearsals this week under the direction of Garry Hynes. Emmerich plays Mitch to Patricia Clarkson’s Blanche. Thesps recently co-starred in the film “Miracle.” Adam Rothenberg and Amy Ryan round out the principals for the D.C. “Streetcar,” which performs throughout May. Although last minute, the O’Byrne-and-Emmerich switch caused a minimum of complications. Both actors are repped by the Gersh Agency. O’Byrne withdrew from “Streetcar” last week when speculation grew that his current play, Bryony Lavery’s drama “Frozen,” might move from the Manhattan Class Co. to a Broadway theater. As of week’s end, the transfer was strongly anticipated but not confirmed. O’Byrne plays a serial killer in the Lavery play, which also stars Swoosie Kurtz and Laila Robins. Doug Hughes directs.