One thing is to increase the scope of maemo.org to non-Maemo platforms and devices. I don't see any problem as long as Maemo platforms and devices are not banned. (following your line of quite-impossible hypothetical cases)

Another thing is that someone ships a product saying that it's based on Maemo when it is not based on the Maemo OS. If someone is interested in the latter then we can discuss. To pick two precedents, "Maemo Community Update" has been around for a while and nothing has happened, while Vivaldi says that is "powered by Mer Core and KDE's Plasma Active".

Mer and/or Vivaldi could decide to leverage on maemo.org their user forums, causing no trademark conflicts.