As a fighter addict, I must say no. A factor zhich has not been evoked in this thread is the GM and the kind of campaign being played. In my campaigns, fighters never feel useless. The highest level we reached with my team was a 31st lvl magician and a 30th lvl fighter (that was me). Sure I wasn't able to create storms or Earthquake, but still my skills remains ever useful.
The mage surely diversifies his magic skills, but they are still magic skills, whereas my character was an able commander, a skilled tracker, a true swordmaster...
OTOH, in a high magic campaign, fighters may be left behind. In some other campaign (Middle Earth for example), you will always have to rely on strong fighters (or thieves, rogues...). Ask Gandalf !