If Lego releases new colors, it would be easy to update the cards either by expanding them with a second plate or by replacing colors that you don’t use often with the new colors and keeping those that you rarely use on an extra plate that you store away. Lego could sell the parts you need to update your chart in the ‘Pick a Brick’ section.

 https://www.eurobricks.com/forum/forums/topic/193515-color-chart-cards/