A far as the 250 goes, I asked my CAM recently what the breakdown of revenue is between the 250 and 3300. She estimated a 40/60 split. No company is going discontinue a product that makes up 40% of their on premise revenue.
She did say that Cloud was eating into 250 sales, and that a year ago the split was closer to 50/50.
Think about the 250 over the last 12-18 months. Phone Manager Updates, Application Suite for Reporting and Recording, 6900 Phone Field Trial, etc. F the plan was to phase it out, the advancements would have stopped a long time ago.