There are no certainties in aviation, or anything else for that matter. The fact is that this is the best pilot market UK aviation has ever seen, right now. If it were to drop to 50% of its current level, it would still be better than it's been for most of the post-war years. The trouble is, as always, that too many people want to be pilots!
If you are going to start down this road, you must first ensure you have the physical and physiological ability to complete the course. Do your class 1 medical and Gapan aptitude tests now.
Secondly, you must decide that you WILL be one of the winners. Nothing should deflect you from your goal, whatever it might be. Many of those who start on this crazy rollercoaster give up; either lack of ability, lack of money, lack of determination, or lack of confidence. That's a hell of a way to waste £50,000.
There will always be some jobs. There will always be some winners. There will always be more losers. It's up to you (subject to ability) which you are....