I don’t dispute your point, but that 58 percent number doesn’t seem anywhere close to what other sources are reporting for desktops. More like 25 percent seems to be the consensus.
Check these out, for instance:
http://www.w3counter.com/globalstats.php
http://stats.wikimedia.org/wikimedia/squids/SquidReportClients.htm
http://clicky.com/marketshare/global/web-browsers/
