"Oops we developed our product on Silverlight because we're an MS-kit company and now Silverlight is crap. Now what?"
Well... MS was that company, up until they weren't.
As such it always amazes me to see otherwise intelligent people complain about Microsoft dumping or abandoning them and their Silverlight-based products.
The technologies in Silverlight are in most cases directly portable to WPF, Windows Phone and WinRT. Any Dev that throws out effort based on Silverlight probably deserves being abandoned.