I think that would be a great move, depending on the limitation imposed. for example for the 2014/15 financial year I had about 112 eligible guest spots, I used maybe 3 of them - maybe. But the next time I had a family holiday with 3 other adults and 2 children, or perhaps 2 other adults and 2 children, I can't guest the group into the lounge unless I go begging, cap in hand (please sir may I have some more).
I'm all for being given (112-X) E-lounge passes if I get the flexibility to guest all of my family on the rare occasions we travel together.