"Marvel's [Agents of S.H.I.E.L.D.](series:722469)" is getting good reviews early in it's second season after only two episodes, but the reviews are not turning into viewership. Tuesday's episode "Heavy is the Head" received some of the lowest numbers in the shows history with a 1.8 in viewers 18-49 and 5.05 million viewers total. That is down from last weeks season premiere of 2.1 and 5.98M. Knowing that ABC has already committed to the "Agent Carter" midseason mini series/tie-in it is safe to say that AoS is not in line for cancellation in the near future. Add to that an almost guaranteed crossover with "Avengers: Age of Ultron" which hits the big screen on May 1, 2015 and AoS is surely going to get through it's sophomore season regardless of how the ratings do.
However with NBC's "Heroes" returning to the airwaves next season, which if I'm not mistaken, also ran in the Tuesday at 9pm Eastern time slot (though we do not know when it will run upon it's return) I can't see how any further drops would warrant a third season. Perhaps AoS will get a bump in the ratings from of all places "Arrow" on the CW. Fans of that show may be inclined to flip over to ABC after the conclusion of that show to keep the comic themed vibe going. It's kind of ironic because AoS moved from the 8pm eastern slot when it was announced that "Arrow" was moving in to give the CW a two night, one-two punch of "Arrow" and "Flash".
Maybe ABC (which is owned by Disney) is comfortable with these numbers and I am reading too deeply into them, but AoS has a hefty price tag and I assume its ad rates are also relatively high. I'm sure ABC has a few tricks up their sleeves like a cinematic guest star or two and/or an exclusive Age of Ultron trailer at some point during November or February sweeps. With "Arrow", "Flash", "Gotham" already on air and "Titans" and "Supergirl" reportedly heading to the small screen next year, it looks like it could be too many options that would spell the true end of the "Agents of S.H.I.E.L.D." instead of H.Y.D.R.A.