No it is not.
Only the listed phones can be upgraded Lumia 1520, 930, 640, 640XL, 730, 735, 830, 532, 535, 540, 635 1GB, 636 1GB, 638 1GB, 430, 435, BLU Win HD w510u, BLU Win HD LTE x150q, MCJ Madosma Q501
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I agree that is the end for the Lumia 928. I have had mine since July 2013 and have been waiting to put the new OS on there and now it is not on the list of devices that will get Windows 10 Mobile. Verizon is not selling any great Windows Phones anymore and I do not honestly know what I will do...
I do not think so. once the latest version is in the store and on your phone there is no going back. You can try using an older phone to go to the store to see if you can get that older version.
telling a fellow Windows Phone user about the new features is not as awesome as it would have been to truly school a hater of WP. I do not get how these salespeople do not know about what they are selling.