Steve
Mostly Harmless
This is a terrible idea and how training models break down entirely, so that we get things like WC anti-grappling or ninjutsu anti-bjj techniques. It's as bad as a BJJ guy who has never sparred with weapons talking about knife defense.I can think of a bunch of solutions to this. If you don't train Wing Chun how do you know what Wing Chun has or hasn't? If the opponent grabs my wrist I can:
-counter with a Tan Da
-counter with a Gwai Jeurn and break his wrist if he doesn't let go.
-counter with a Kwan Sao and Po Pai Jeung.
-counter with a Heun Sau and Pak Da.
There you go. 3 solutions to the "hand grab" situation.
Traditional Wing Chun can work well against "modern" fighters, and one way of doing this is sparring with one Wing Chun fighter doing Wing Chun only, and the other Wing Chun fighter using techniques from other styles (boxing, kickboxing, etc.).
I would say sparring with actual kickboxers, boxers, wrestlers, mma-ists or what have you, is how you might be able to apply your skills against "modern" fighters (whatever that may mean).