They have probably just flushed their company down the toilet. Time for employees to start updating resumes and thinking about what office equipment will be up for grabs when the layoffs start.
The thing with this is that FTDI did not only screw their intended target, the users of fake chips --- they also screwed their LEGITIMATE paying customers. Those customers are making products to sell to end users. And end users are not going to want FTDI chips in their devices, legit or fake, because they have no way of knowing if they really are legit. Why take a chance? Just buy something that does not use FTDI. Current legitimate customers of FTDI are surely already looking for alternatives, just so they don't have to deal with that question being raised by their end users. You won't keep your own customers if you cause doubt among THEIR customers, and FTDI just violated that.
You can argue back and forth all day whether FTDI was within their rights to disable fake FTDI chips, but that's really a legal and/or ethical question. As a practical business move, it was really stupid.