'Is the Priesthood destroyed?'
No. There is still the Society of St. Pius X.
'Have they made good this threat from Protocol 17?'
No, but they have done an extraordinary amount of damage.
Just keep in mind, it is always darkest before the dawn. Hold to your Catholic Faith, avoid Modernism like the plague, and you will be just fine. Just realise you might have to suffer anonymous martyrdom in the process.
Remember: you are trying to get to Heaven. Whatever happens here on earth, in the end, just doesnt matter.