A few things:
1. We need a sound decoder that is less than 10mm wide. This would accommodate hood units that wouldn't fit ESU decoders.
2. We have a few Next18 engines, but they all offer factory ESU sound. The price between sound and non sound is usually about $75, so most modelers would just use the ESU factory decoder.
3. I think there is a market for adapter boards to update DCC ready Atlas and Kato engines to Next18. But these would need to be available separately so we can purchase these and use an ESU decoder if we choose to.
4. Lack of sound files is going to really hurt any decoder made available. One way around this is to open the sound files up so we can use our own .WAV files for sound functions. I think Zimo has unlocked decoder sound that use .WAV files. If this decoder was able to use Zimo files, that would be a big help. Digitrax files may also be unlocked, but they are no where near as good.
We really, REALLY need to standardize sound files across decoder manufacturers. Maybe this could kick start something.
5. Most modelers tend to standardize decoder use. For example, I use NCE for standard DCC installs and ESU for sound. I will use TSC and Digitrax for specific engines that require a form factor that is not available from NCE or ESU. While I like Broadway sound decoders, running them with ESU sound can be problematic because of manufacturer specif9c features. I can't use Drive Hold on ESU decoders for example.
A new decoder would only complicate this. If the decoder was programed to mimic the features of an ESU, TCS or BLI decoder, that would help. I do not know if features like Drive Hold are patented though.
There is a Chinese DCC decoder that mimics the feature set of older TCS decoders. So it has been done before, just not in sound.
6. I'm not sure many modelers would put money on a kickstarter like program. We need to see a working version before purchase. We have been burned by too many flaky products before (looking at you, BLI).