what are the development plans for shimano to get rid of 10speed
They haven't got rid of 5-speed yet, but even in the unlikely event that Shimano go weird/bust, the Chinese will keep making 10-speed HG consumables for decades because there will be money to be made.
I think my garbled point was "should I, how long will 10speed live, what are the development plans for shimano to get rid of 10speed by when?"