Seems like Schwab screwed up when they dumped Cybertrader as a platform. How much do you think it would cost to buy it from Schwab? Just the platform, no the accounts.
I'd guess that even tho it is no longer used, they'd ask (nay, demand) 6-7 figures for the software if they wanted to unload it, but odds are they won't. They will keep it inhouse and find a way to use it with the current system, esp if it is as good as you all say it was.