I believe what SE had in mind regarding the LS/FC sizes was that FC would be comprised of a large number of people that would group up in large numbers to battle and linkshells are more to the social end. As far as the size.. in FFXI we made due with a limit of 36 members in our LS. I'm not sure what the idea is behind feeling a need to have hundreds of people in your linkshell but it's a popular apparently. Personally I'm completely fine with the current limits. I'd rather know everyone in my shell.