I am no economy expert, but I think that until Qatar 2022 there will still be recruitment.
Brexit and the 737MAX issue raised uncertainties in Europe, but I still see lots of jobs offer in the rest of the world. If you are lucky to be able to work in the US, you will get a job as long as you have a heart bit.
I reckon at the beginning of 2020 we will see again be opportunities and Ryanair will start recruitment again.