High-concept serialized dramas tend to shed viewers as evident by the steady declined of NBC’s Revolution last year. CBS‘ summer breakout Under The Dome hit a new adults 18-49 low in the fast nationals last night, 2.3/7. Following an initial rise, the series based on Stephen King’s novel has now slipped for three straight weeks (2.8>2.7>2.5>2.3). There are mitigating factors. First, for the past two Mondays, some 3.2 million potential viewers have had no access to CBS because of the Time Warner Cable carriage dispute. There are indications that piracy downloads of Under The Dome have spiked in the blacked-out areas. Additionally, given that the show is available on Amazon four days after air, viewers who fall behind on the serialized drama may be opting to catch up on the streaming service (or on DVR). Even with the decline, Under The Dome remained Monday’s top program in 18-49 and total viewers (10.14 million). ABC‘s three-hour CMA Music Festival (2.0/6) rebounded big from last year when it faced the season premieres of The Voice, Revolution and Bones. Against lesser competition, the music special was up 33%, leading ABC to a nightly win in 18-49 and total viewers as CBS aired two hours of comedy repeats. Also bouncing back from last week’s decline was American Ninja Warrior on NBC (1.6/5, up 14%). Freshman reality series Get Out Alive (1.4/4) is looking better and better for renewal, inching up by a tenth for a second straight week. Acquired drama Siberia (0.7/2) was even with last week’s fast national, up a tenth from the final. The CW’s Breaking Pointe (0.2/1) also was up a tenth from last week’s low of 0.1.