I suspect they'll drop development soon, given rumours Surface Phone won't appear for another year or longer and no more lumia phones. No one is going to develop for a platform with no products.
That's what they wanted, but it's not happening. The non MS products are extremely limited in number and get zero publicity. No one wants them. Key thing about Surface is it acts as a reference model. Like Google does with their own devices. But Surface Phone doesn't exist and by the time it does (if it does) it's way too late. Got to realise that companies need a year or two planning for their next device and aren't going to even think about it until they see the Surface Phone, which means a year or two longer to see their versions. Not going to happen. Shareholders will demand products now, and that will be Android.LOL there are products, just not those manufactured by MS... and from what MS has said recently, that's exactly what they wanted