NO dude, domain names is no one's property unless bought by them. It is simply based on first come, first serve basis. If you didn't bother to buy all the domain extentions your domain name is associated with, then it's simply your problem, not anyone else's. Take any global brand for example, they've registered all possible extentions for say like intel.com, intel.org, intel.xxx etc.. etc.. although all the domains will never be used. This is simply because of the fact that if someone say for example bought intel.co.in before intel did, then intel would have to pay huge amounts to the person who holds the .co.in domain as intel needs it anyways.
Domain names cannot be classified as infringing upon registered trade marks unless someone manipulates the domain names to get stolen traffic. say for eg intels.com could be infringing if they make a mirror copy of intel.com to get traffic they don't deserve, but if someone has intels.com with something on their own that in no way has anything to do with stealing the traffic, then no one can sue them..
BTW, we're talking about holding domain names and not putting up a site on those domain names. So, when ever there is a new extension up for grabs, for eg the recent .asia, try your best to buy domains of big companies, they pay big money if they want the domain. Several domain names have been sold for over $100,000.
Edit:
Domain sex.com was sold for $14 Million
creditcard.com $3Million
Business.com $7.5 million
Casino.com $5.5 million
AsSeenOnTv.com $5.1 million
Altavista.com $3.3 million
Wine.com $2.9 million
Autos.com $2.2 million
Express.com $1.8 million
Men.com $1.3 million
Wallstreet.com $1m
Rock.com $1m
Websites.com $970,000
Drugs.com $830,000