Print and electronic versions could be published simultaneously, or electronic before print. Links from the main online bibliographic databases to journals, but also back to them. A quality archive is important, and assured access to the archive. Ability to search subsections of the full text, e.g. conclusions. Local Support Guaranteed access is important, i.e. what if the publisher's server goes down Friday and there's no access until Monday.
Resources are finite.
Training for new users and students. Cost User authentication. New Requirements to Add Unique IDs for each journal article. Overall they seem the right user requirements. For example, most disciplines want rapid publication, and few want multimedia content.