Today, 14 years after it’s adoption, do the enhanced surveillance techniques still serve a necessary purpose?

Title II of the USA Patriot Act allows for enhanced surveillance procedures. Eric Snowden’s release of classified material made the public aware of the amount of information collected by federal agencies. Today, 14 years after it’s adoption, do the enhanced surveillance techniques still serve a necessary purpose? Are roving wiretaps a necessary tool for local and federal law enforcement? Should a citizen’s ‘expectation of privacy’ be redefined in today’s technology driven world – do we really expect confidentiality when sending data across publically licensed wireless infrastructure?