I think Microsoft have quite a bit more market share than Apple...
To put it another way, I either have to learn a new technology or become my own distributor. If I decide to learn a new technology, I'm now choosing between unproven Windows 8, with MS' horrible track record competing with Apple, or another proven OS with tons of market penetration. Why would I choose DirectX?
(In you mean only in mobile phones, true, Microsoft aren't doing great. But then on market share, there are better platforms than Apple too, anyway.)
To answer the first statement about no XNA with metro interface, if the platform is toting the new interface as the future of PCs, why would I want to continue developing apps that don't use it? You don't have to explicitly stop supporting a tool to kill it. If I wasn't a hobbyist, I would be transitioning to iPhone or Android development to prepare for the future.[/quote]Well, if you think that everyone's going to be using IPhones instead of computers, sure. I really hope not...
Anyhow, Apple have a long history of ditching technology and APIs when it suits them, whilst Microsoft are pretty good on giving long support with backwards compatibility. It seems odd to bring them up, of all companies, as a better alternative here.
What track record? We've yet to have a non-phone tablet war.
2. Convert to the new DirectX, you're taking a step backwards in terms of managed code. You're target market is competing against the apple iPad and any new tablets coming to market in the next year and a half. MS has a bad track record in the last few years in this kind of war.
MS haven't done well with their mobile OS, but Windows 8 isn't a mobile OS. MS have done very well with Windows, of which 8 is a continuation, including on mobile devices like netbooks (which are the same market as tablets - we don't categories phones by whether they have a physical keyboard or not), despite Linux having a head start.
3. Develop for another platform with much greater market penetration in tablets(ie iPad, Amazon, etc.)[/quote]Windows has a far bigger market share.
#3 is bad for MS. They're already losing market share to iPads in the PC division, this just makes it worse.[/quote]I've not seen any evidence that MS have _lost sales_ as a result of the IPads? Note, it's a fallacy to look at simple market share in a growing market - when new products are added to a market, it's expected that the market share of the existing products must fall, even if their sales are actually increasing. The IPad's market share will fall as new Android tablets come put.
So if MS loses that edge of easy development, why would anyone choose that platform willingly?[/quote]Maybe same reason people write IPad and IPhone games when they had tiny market share, and there have always been larger platforms.