They are completely shameless in repetitive meaningless patent and trademark filings, as well as their nebulous, unverifible "expectations."
They'll keep going as long as the money holds out. Can you see Apple, Samsung, Google, etc., announcing stuff and doing nothing for years afterwards?
BTW, I know guys with 10-20 patents who have never been able to make a dime from them. Having a patent or a trademark is worthless in and of itself.
LL