a single access point (at 11 Mbps) provides roughly the same throughput as a wired 10Mbps segment.. Therefore if you put 10 users who were quite happily working away on a 10 Mbps segment that was wired, onto the wireless 11Mbps segment, they should not notice any difference. Of course, bear in mind that the Wireless access point is the equivalent of a hub, resulting similar quantities of collisions. Also other factors such as interference, multipath etc need to be accounted for.
The access points themselves are capable of thousands of associations, but then again, you wouldn't have thousands of users on 1 Ethernet segment would you?