The problem with trying to brick things is it's only a free action to go wireless off. So you only get one shot against a savvy opponent.
A free action per piece of (linked) equipment, is it not? Or is there is an option to turn off multplie devices with a single free action, that I am overlooking atm.?
If not, then that changes the equation considerably.
...
What do you think ?
I consider such a matrix attack to be the equivalent of a well placed sniper rifle.
It requires scouting and preparation, but is potentially devastating. If the NPCs remain unnoticed while they set up their attack (and place marks) the players will feel pretty helpless.
Sadly, most of the rules were written with the players being the active party in mind. Having them on the receiving end, especially with anything matrix related, often results in raised eyebrows.
Make sure your players are ok with that. And with being blindsided like that. Just as with snipers having the GM roll stuff in secret and then, without warning, be screwed, might ruffle some feathers.
It would be prudent to either use foreshadowing or having a very good and thematic ingame reason and opportunity for such a set-up. And even then use it sparingly.
Otherwise your players are going to start to poke the matrix rules for loopholes. And you absolutely don´t want that.
The idea to pay some third-world teenager to PAN your gear to his link and browse in some obscure crap host where he is completely untraceable is one of the more sane discussions that can be had over this.