I suppose it depends what you mean by practical. I use GR to simultaneously monitor several NBFM channels, and also for HF comms. SDR will probably never have

I suppose it depends what you mean by practical. I use GR to simultaneously monitor several NBFM channels, and also for HF comms. SDR will probably never have the speed of dedicated hardware, or the power consumption of low power analog circuitry. But SDR definetly has it's place, and can outperform many classic architectures if power is not an issue.