I don't think there is an issue with graceful degradation. Basically, wkterm is a terminal and a set of pretty-printers that read data from stdin and print it in html. As in my example with cpu usage graphic, there is some ./gen_cpu program which just prints cpu usage values as text, and there is graph drawing program. So, use them both for graphical output and use only the first for text.

Links, as you describe them, can be implemented with javascript. I'll try to make an example on weekend.