At least three potential customers
The downside with such a product is that it will cost money. If I take it further and try to make it a real product, my guess is that the price tag will be in the $600-$900 price range. But that really depends on the feature set and how big the volume is. FCC approval is also quite expensive, but I believe is mandatory for selling RF-equipment in the US.
I have really no clue on how big the world wide long range shooting community is and if there is going to be a market for such a product.