Yes, absolutely!!! I agree 100%! Good Yip Man Wing Chun has lots of options once one dissects the forms, etc. Well said Joy!
If you have never trained for ground-fighting, then certainly apply whatever you have learned from Wing Chun in any way you can on the ground! But if you are really concerned about ground-fighting, don't rely on this. Wing Chun was not designed to be used on the ground. It will never measure up to a method that WAS purposefully designed for ground-fighting like BJJ, Harimau, Buah, etc. I say do the best with what you have, but don't be afraid to expand your training into other ranges. One wouldn't try to hunt a grizzly bear with a 9mm handgun or sail around the world in a row boat. The right tool at the right time is the best approach. You can get by with a tool that has been adapted, but it may not get optimal results. At least that's my 2 cents.