Ubuntu to Bring About Red Hat's Demise?
"It may not happen in the short term, but .."
It won't happen in the long term either. Yes, Ubuntu is becoming ever more popular, but this is an expanding market. There are new users arriving on the 'Linux' scene every second. Red Hat may not grow at the same pace as Ubuntu in the short, medium, or long term, but it will grow.
All Ubuntu has done has made the competition for new desktop customers more intense. Red Hat will continue to specialise in the server market where it will continue to grow due to providing valued sevice.
Market trends determine the prospects of a company as much as (if not more than) the competition.