honestly, weight loss is about 90% food and only 10% exercise. I know WLS patients who lost a ton of weight even without exercise. That said, exercise is great for your overall health and people should do it - but an injury that causes a temporary pause in your routine is not going to be the end of your weight loss.
also, you could be in a stall - they're very common. Just stick to your program and your weight loss will eventually start up again. Stalls usually last 1-3 weeks.
and no, I doubt "this is it" as long as you're adhering to your program. Most of us lose for a year - if not more (20 months for me - but I started out much heavier than you, so I had a lot more to lose)