At £150 I would renew and would probably consider anything up to the £200 figure, but at this years prices not a chance. But that's only because at that price if I don't make it to games I could still justify the price, as I know if I didn't buy a season ticket id probably still pay enough times on the gate over a season to make a season ticket work out cheaper.
Its not going to happen though in my opinion, if we stay up prices will stay the same and if we going down maybe a small reduction of £20-£30 I guess but nothing massive, so im sure I wont be renewing.