Right. Ethereum is just a medium for recording a contractual agreement. Using ethereum should not make contracts any more enforceable in the eyes of the law.

In many cases I would assume the opposite will occur: plaintiffs will claim that there was no contract formation because because the technical mumbo-jumbo of computer code is incomprehensible to a layman.

I suspect that courts will react quite favorably to this argument seeing as how they have a natural interest in maintaining their jurisdiction.