Yeah, they're at the pinnacle. Can you tell me what scanners pick up as much? I said it earlier, "The SDS100/200 will allow you to hear just about everything you're entitled to listen to." That's not to say they can't be improved. There is still some tweaking left to be done. I can compare all this it to the Model T. It was the pinnacle of auto manufacturing in its day. As technology changed, so did the car industry. I remember tunable police receivers. Then crystals came out. That was the best thing since pay toilets. Well, it's improved to the point that you almost can't buy crystals anymore.
You're right. the SDS scanners are not perfect but they're "perfecter" than the ones they replaced. When the technology changes, so will the scanners, sending the pinnacle a little higher.
I'm sure the technology could/would evolve, but Uniden needs to see digital scanners as a viable business line. As more systems encrypt, scanner demand will drop or has dropped already, so that will be their deciding factor when weighing whether to develop a whole new radio, not technology. They could keep doing minor tweaks to the current radios perhaps.