imo a tcma will adapt, and strive to meet regional/local and modern combat necessities.
i think many times people say 'traditional chinese martial arts' when they really mean 'Antiquated', 'dead' or 'stagnant' chinese martial arts. an actual tcma will have cross training and a modern approach to self defense and combat. the traditional aspects that hold up to modern scrutiny will be retained, the unecessary will be eliminated. this of course in regards to combat oriented and focused training martial arts.
No one is going to fair well in a multiple attacker drug induced psycho mosh attack. This is why riot police wear armor, use shields, weapons, and work in teams. No amount of training will see you out of a situation that has you facing off against multiple people who want to due you violence if you choose to stay and fight. Running in that situation is your only option unless you posess superior weaponry and a method of not taking extreme damage to your body. The best method in this case is distance and firepower. Not a very likely scenario.
In regards to general violence that people experience on a regular basis around the world, Chinese martial arts are just as good as any other combat training, if you train with the proper intention and find a school that meets that need.
i think however, we can all agree that finding that school is the first obstacle, and may not always be an option depending on where you are.
For whoso comes amongst many shall one day find that no one man is by so far the mightiest of all.