My CS is a 21 plate. I have no hope at all that VW will fix the Bongs, as it seems to be a combination of poor software and hardware. The software could probably be fixed, given suitable investment (in time and money) but I think the parts causing the problems are fundamental to the cars electronics and would cost VW too much to repair the millions of cars that they've already sold.
They may get better/more suitable parts for later cars and I'd expect any Mk8.5 to be Bong free.
Older cars like mine will always be flawed and anybody buying one will need to live with it. I miss Travel Assist for long journeys but other than that I've learned to live with the problems.