You overstate the case:
"EISFA offers four membership categories for the ice sport industry:" The words "ice sport industry" is not used as a name, it's an expanded phrase.
True - but I think you shouldn't be able to trademark a phrase that is already in common use.
And I still don't get the purpose of renaming it. What was wrong with "Ice Skating Institute"?
(For that matter, what was wrong with USFSA, that it had to be shortened to USFS - And only for SOME purposes, which makes it more confusing?)
If General Motors suddenly renamed itself Generic Mobility, it wouldn't be good for business. The same applies to ISI.