There is one main reason that consumers completely miss that means that Windows 10 mobile will be here and supported for a long time: Business. In business Microsoft give 150%. Business customers are slowly moving to use Microsoft mobile phones, and in business, Microsoft provides long term commitments. This is an important part of the vision and one they are selling hard in the corporate world.
In the consumer space they are committed to Windows 10 and supporting developers in writing Universal Apps which will run on anything. That will benefit the phones too as UWP apps are easily made phone friendly.
As others have mentioned, expect innovative new phone hardware with eye opening capability, possibly two-in-ones that bring attention back to Windows 10 in the mobile space.
Windows phones are definitely not going away and Windows 10 will be supported for a long time. The 950 range has enough hardware to be great for a 2-3 years, which is a lifetime in mobile tech.