For me the perfect killer app would be one with the following
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One Time charge for the Channels DVR component. No Guide included, but with support for Schedules Direct for those already with an account
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Option: Annual or Monthly (Max $10/month) subscription for Guide
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Option: $2/month additional to ALSO support the SDDVR. (You guys have already done ALOT of work related to the SDDVR and many have bought Channels and even additional/new ATV4s with the expectation that it would work with the SDDVR). Understandable if the Channels DVR would be a pre requisite for the SDDVR feature.
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Option: DRM (Max additional $4.00/ Month) for DRM (this should cover either/or both SDDVR and Channels DVR DRM