I have a poodle who has been hit by a car should I put him down or hope he gets better?

My dog was hit by a car on Wednesday. I took him the vet and they took xrays and told me what was wrong with him. Due to finances I am able to pay for numerous operations. My dog has a fractured pelvis, fractured back bone, hole in his skin, hernia, an organ has be submerged someone else and he has a cloudy lung. The vet said that due to his pelvis not been extreme he could be locked in the laundry for 6 weeks and only taken out to go to the toilet. He said that with rest that would improve. I purchased antibiotics and pain killers which I give him twice a day. The vet said he can live with a hernia. With antibiotics his lung infection should clear up. With the hole in his skin I have to clean once per day. With the organ somewhere else he is not too concerned and said that it usual in trauma in dogs and they could live a long life as he has had dogs come into his surgery and the owners didn't even know that that was the case. He appears to be drinking, eating and going to the toilet okay. He doesn't move around much and is resting. I feel that I should my dog the chance to recover in 6 weeks and hope for the best. I feel that if he has no improvement I will have to put him down because I would need numerous operations which would be beyond my reach. What do you think?