Personally I would like to see license options which don't force the requirement for attribution. In fact earlier versions of the CC had attribution as an option.
As an academic -- I will always reference my sources through attribution -- even if there is no legal requirement to do so. That said I can also see why many academics may want to ensure attribution. Either way -- I think its more important to widen the knowledge base of the intellectual commons -- and if this means a "thousand flowers" of licenses -- sobeit as long as there are reciprocal compatability clauses among all the free content licenses.