This is almost certainly the reason WHY engies have not had the same "rebooting" that most of the other prof's have had in this latest test patch, there is far more involved in the process of ruining all our engies than just nerfing some nano's.
it requires nano changes, symb changes, perk changes and a whole bunch of itemisation before it even becomes a viable option to simply test them.
As for it being an option of picking trade skills OR nanoskills, I've looked all over and i still only see traders getting this option, while all the info i can find, squarely forces engies in to a trade skill required state.
possibly the dumbest idea ever by the way, since when it happens we'll all have to completely refarm our setups... "Yay for making all my friends drag a 100% useless toon around all the high lvl raids and pf's so i can get back in to a semi usable state!", also, when it happens, i hope everyone enjoys blaming the devs for not being able to get thier combined armour made due to half the engie population flat out quiting and the other half being too broken to actualy do anything.(while it would have been an option to have a trader do this instead, having seen how they are being mutilated, i doubt any of them will stick around either)