This kind of thing has been attempted in the past. For example, after the Lego brick patents expired, Lego sued Mega Bloks (in Canada) claiming a trademark over the design of the brick. They lost the case, because the Supreme Court (of Canada) ruled you can’t double‐dip on IP protection by turning a functional (i.e., patentable) design into a trademark.
Disney putting Steamboat Willie in their logo is unlikely to actually allow Disney to effectively extend restrictions on the cartoon—but I wouldn’t be surprised if it was a calculated move to deter people from reproducing Steamboat Willie after its liberation simply by the implicit threat of expensive litigation from a very large team of lawyers.
> They lost the case, because the Supreme Court (of Canada) ruled you can’t double‐dip on IP protection by turning a functional (i.e., patentable) design into a trademark.
Nintendo did attempt that trick, although the case you’re thinking of is Sega v. Accolade, which as you said, ruled that forcing your competitor to display your trademark unwillingly doesn’t mean you can smack them down for trademark infringement.
The case was SEGA v. Accolade, but the lockout system on the Genesis worked on the same legal theory (e.g. induced trademark infringement equals Doctorowian[0] interpretations of "intellectual property"[1]). For the Game Boy, the problem was that Taiwan[2] didn't have a copyright treaty with Japan, but they did have a trademark treaty, so if you induced pirates to commit a trademark violation you could get them with something. Same idea, but the jurisdiction is different, so all the existing case law about not turning trademark into mutant perpetual copyright wouldn't apply here.
[0] "Intellectual property is any law that allows you to dictate the conduct of your competitors." - Cory Doctorow, paraphrased
[1] Yes, it's a shitty made-up term to make you confuse four different kinds of law, no I don't care. There's enough negative sentiment around "intellectual property" these days that the Stallmanian position sounds like a defense of it now.
>Disney putting Steamboat Willie in their logo is unlikely to actually allow Disney
We're talking about a company that caused copyright duration to be extended, ha ha.
Disney putting Steamboat Willie in their logo is unlikely to actually allow Disney to effectively extend restrictions on the cartoon—but I wouldn’t be surprised if it was a calculated move to deter people from reproducing Steamboat Willie after its liberation simply by the implicit threat of expensive litigation from a very large team of lawyers.