This morning’s news has been expected for some time now, but does officially mark the end. I know that John Chen has stated that BlackBerry 10 users “can continue to depend on us”, but they have said that many times before and it has never been true.
BlackBerry 10 is an operating system that has not received a major upgrade in over a year, with no future improvements expected. With no new hardware expected for the platform either, it is safe to say that platform is officially dead.
The decision to announce this change on the day that Apple launched a new phone of their own was probably an attempt to bury this news. In practice it reminds current BlackBerry users of the obvious way forwards.