I’d argue that speech recognition was a flop. It depends on what the intended purpose was vs the application we have now. Back in 1991 I worked for a 3rd Party Technical services company. The major vendor of Electronic Pre-Press Systems, ATEX had a problem with its keyboards and Carpal Tunnel Syndrome. One of the remedies was Dragon Dictate which we interfaced with the ATEX Operating system. Dragon Dictate went through some improvements in its recognition of utterances, especially those in say....Arabic. It is now owned by Nuance. The new product is DragonNet and is the backbone for Carnivore and Echelon.