When Stephen Colbert was announced as David Letterman’s replacement as host of CBS’ The Late Show last week, it set off a whole new round of speculation about late-night talk shows. John Oliver, who successfully filled in for Jon Stewart as host of Comedy Central’s The Daily Show last summer, debuts his new HBO show Last Week Tonight this week, having left Comedy Central just before he could have had the chance to replace Colbert. With Jimmy Fallon’s takeover of The Tonight Show, Seth Meyers replacing Fallon as host of Late Night, Chelsea Handler’s plans to leave E! and the likelihood of Craig Ferguson leaving The Late Late Show, the landscape of late-night talk shows is more unstable than it has been in a long time. If Oliver can tune all of that out and just deliver the clever political satire he perfected on The Daily Show, then Last Week Tonight should turn out just fine.