Skype happens to be more focused on International calls. Unless you consume such services I don't think you'll find their product targeted towards you. Perhaps this is attenuated by its lack of traction in developing markets such as Kenya. I think they are trying to reach the same audience as WhatsApp via their 'Qik Messenger' buyout. I hope that reframes your thoughts not the company.

For the short-term I would not worry too much about WhatsApp eroding voice revenues for local carriers. I see this service as a Value addition for WhatsApp to differentiate itself from competitors as a one-size fits all tool. Perhaps something to get users excited about. On the local front, existing infrastructure and data costs shouldn't make the cellular market shift their habits immediately.
I base this on the following. One, a majority of Kenyans do not have smartphones. Two, data costs are pretty expensive for the larger smartphone using population. Most Kenyans primarily use Safaricom and their data would be pretty expensive for data calls. Maybe airtel users may adopt the service quicker. Three, this product is targeted at smartphone users. However, most handsets have limited battery life. Most users simply will not let their 3G or 4G settings remain on for the purposes of receiving a call, at cost, when the same can be achieved more efficiently through traditional means. Four, not everyone uses WhatsApp despite its widespread adoption here. Five, 3G coverage in the country.

With improved battery technology, carrier infrastructure and increased adoption, perhaps these points may be moot in future.

I'm open to criticism or thoughts on the same.

This makes sense call charges are applied to both the caller and the receiver.in terms of mb's

fiber and telco guys should lower prices. fast unlimited internet way to go

But receiving the images, videos and text also consume data.

Data prices and availability will definitely come down with time, I don't think voice prices will match the same.