What are possible scenarios regarding ownership of the "bitcoin" trademark (currently held by Mt. Gox) if owner goes bankrupt, or dissolves, or fails in other similar ways?
due to the decentralized nature of crypto currencies trademarks and copyrights are the property of the entire bitcoin/cryptocurrency community
That's very nice and cuddly, but probably not true.
In the UK, the Bitcoin trademark is indeed owned by Mt Gox:
https://bitcointalk.org/index.php?topic=82224.0even if someone did register and try to profit they would fail pretty quickly
Mtgox statement:
We registered the Bitcoin trademark to protect it and allow anyone to use Bitcoins without risking to be attacked by our Pascazi friends (or other people).
More people using Bitcoin freely is of course good for our business. Some US lawyer registering the trademark in various countries with plans to profit from the registration and not by allowing more people to use Bitcoin is bad for our business.
We didn't register the trademark for the purpose of preventing others from using the word Bitcoin, but to protect ourselves and our customers from people who have this kind of mindset.