No, those face more threat from ARM M4/7 cores or RISC-V units with vector/SIMD coprocessors. DSP cores are being lifted out of discrete chips and placed as IP

No, those face more threat from ARM M4/7 cores or RISC-V units with vector/SIMD coprocessors. DSP cores are being lifted out of discrete chips and placed as IP blocks into more integrated solutions, with the really complex algo stuff placed in general purpose hardware like FPGAs. The economics don't really make sense for TI/ADI DSPs imo. If you had an application where you needed a chip just to do DSP you'd probably use an ARM core instead - but the applications engineers at TI/ADI will gladly help you find a product in their catalog that has more features integrated into it (like ADC/DAC, even analog front ends for audio/RF, USB/Bluetooth stacks) for your product. Basically there's no market to kill, from what I've seen.