Programed obsolescence
The Land Rover Defender is one of the last cars challenging Programed Obsolescence, nobody wants to build a car that lasts forever anymore, the good thing though, is that parts for older models will be available again by the heritage division of JLR http://www.autoblog.com/2015/04/16/land-rover-heritage-official/
Hopefully they will have stick sets and canvas tops available at sensible prices for my 1961 88" Series 2.