That's unnecessarily gloomy, there is a current shortage of pilots on the front line and that is only going to be exacerbated over the next few years.
As long as you are not outside the new eyesight parameters, you're relative short-shortsightedness to your competitive peers will mean absolutely f*ck all. All they will be bothered about is how you did in the aptitude, the rest of oasc and later on down the line, your flying training.
Remember that everybody is accepted as a pilot and then streamed after EFT, rather than being selected for specific roles before IOT; it would be wise to enter flying training with the knowledge that you may well end up as a multies guy...even if you get chopped from Linton or Valley, most re-role on a different aircraft and a lot of my friends love the job and lifestyle the other aircraft types afford them.
The recruitment cycle goes up and down in peaks and troughs, we've just been through a humongo-trough, so you might be quite lucky with the timings...they're supposedly taking 80-100 pilots for the financial year beginning April 1st.
At the end of the day, they're always going to need pilots...maybe not as many as the bad old days when you could join with a solitary E in A-level art, but they will still be looking for them...and as an intelligent guy, why shouldn't it be you?
Just make yourself as competitive as you possibly can!