If (for any reasonably probable value of final pricing) the cost of voice recognition is a material factor in determining whether the application is economically feasible, you have larger problems. In other words: if your application's economics are going to swing materially depending on how this is priced, it's probably not going to work out even if they keep it free.
Apps can involve users speaking for ten seconds making selections, or an hour getting transcribed. Right now, we don't know the order of magnitude; adding voice interaction to an app could be $.01/user/year or it could be $100/user/year.
It depends. Imagine a hardware device that uses the speech API, and you're looking at the 3 year cost of an average of 5 speech interactions per day (something like the Amazon Echo). Using Nuance pricing of $0.008/request, you're adding 365 * 3 * 5 * $.008 = $43.80 in cost above the BOM cost; It's entirely possible that adding $20 to the BOM is viable, but adding $40 is not.
