I think most of the non-success outcomes involve an objectively bad experience, regardless of the price. Example of that would be a buggy system that feels more like a cut down PC than a console. From reviews, we see that this outcome doesn't seem to be the case.

The other potential failure outcomes involve selling the product at a loss, or tying up too much cash in it and having liquidity issues while stock moves. Valve's cash flow is likely excellent, we know they're not selling it at a loss and we know they aren't producing too many.

So overall, the possible outcomes all seem like different degrees of success.