Actually Shuai Jiao is probably the only TCMA I think has 100% valid application in its field which is wrestling for takedowns from the clinch. It would need to be supplemented by some very good clinch striking work (much like Judo) which would probably be muay Thai.
Sanda uses modern training methods and equipment and is a relatively recent creation so I wouldn't say it's traditional.
I'll wait to see. I'd love it if they could start winning. It would be nice to see a bit more variety as we've seen on occasion with some judoka and samboists.