Hi - posting this on behalf of @Leatherbrenn darby, who accidentally posted into the talkpage description. Thanks for your feedback, Leatherbrenn darby!
Wikipedia collection was a great feature and the idea could be extented as creating one archieve where the links of libraries/collections are available and the anonymous person could visit any of the libraries/collections that is arranged by any registered user. And in that way any person could select any library, and search topics within them and read about it. Nowdays, people search wikipedia about the info they want but this feature will allow them to use wikipedia a great time killing tool just like social networks because then people would have lots of collection before them with beautiful cover pictures and they will chose which collection to dig in accordingly.
I feel sad that collection feature is gone but i had thought someday, it would make wikipedia a very interesting place to hang up for netizens.