I do think there is a future for DSD, but not in the traditional separate DAC/Amp sections that we use today. DSD is a pulse density modulated(PDM) signal that is extremely similar to the pulse width modulation(PWM) that class D amplifiers use. This means you could maintain the purity of the signal by discarding the DAC and feeding it straight to the Class D processor with some minor conversion of the signal but nothing like the D/A conversion required for a typical setup.
There are very few truly digital amp, like the NAD M2 amp, but I am sure they tend to take PCM and use some sort of signal processing to make it compatible for the class D stage. Starting with a DSD signal seems to reduce the potential for signal modification in this setup and would reduce some of the hardware requirements that go with it.
While this probably won't happen exactly as I described, I do think it is inevitable that we'll have systems that maintain a digital signal until the headphone outputs. For speakers I think it will go even further with an amp at each driver that are fed signals from a DSP instead of using passive crossovers, thereby maintaining a digital signal all the way to the speaker drivers themselves.