Claire, it is quite natural to be anxious and to raise doubts. When I bought my house few years back, I too had many doubts of the similar kind. The pool in the pic definitely needs lot of maintenance work. As for the edges, I guess reducing the height is a good option since they reduce the area too. But there should be a logical progression ie the exit point from the house, the pool fence and the pool steps so that there is a continuity. Raised edges may hamper your view for the rest of the ground. About raising the patio surrounding, check for the best practical solution. Try approaching custom pool builders like solda pools for pro advice. But removing the existing pool is not a feasible idea rather go for renovation. Waiting for your updates on pool renovation. Best wishes.