My initial recommendation is to not change whatever works for you.
The Genie DVR buys you the capability of recording shows from multiple channels simultaneously. If you're not into DVRing, then that would be a bunch of wasted capacity that you simply wouldn't use. Further, if that Genie DVR were to ever go out on you, you'd be relegated to one of your other HD receivers anyway (most folks here are recommended to always keep a stand-alone receiver of some type alongside their Genie DVR just for this reason).
Further, there is a topological reason for questioning getting the Genie DVR -- you have to upgrade your back-end networking. That means that you'd have to have a SWiM device (Google "SWiM" (sans quotes) to better understand) in order to work with a Genie DVR, so unless you have a DirecTV-branded SWiM (which is, incidentally, backwards-compatible with existing receivers/DVRs), you're talking about having additional hardware also added. On the flip side, the beauty of a SWiM network topology is that you only ever have to run one coaxial cable to each receiver, even if it's a Genie DVR 5-channel receiver (due to multiplexing five logical channels over one physical cable).
Based on the announced new hardware from DirecTV, it would appear that ATT/DirecTV definitely has you in mind. Their new receiver -- a slightly scaled down version of the Genie -- "turns into" a DVR by virtue of having a DirecTV-branded hard drive attached to the device. Otherwise, without the hard drive, it's in "lite" mode.
As a final note, DirecTV is now solely into leasing equipment, even if you buy the devices outright. Therefore, you're going to pay that receiver lease fee no matter what device you have; a Genie DVR is no more or less expensive to lease than any other receiver.
