[OneWingedShark]

I’m all right with collecting the ‘metadata’ so long as it’s not accessed without a warrant.

That's the biggest problem: if it's collected at all it will be accessed, regardless of warrant.

[mrsmith]

“if it’s collected at all it will be accessed”

I would assume so through error or malice, but I’ve seen no reports of it happening. Snowden didn’t present any evidence of it. There are claims the courts issue warrants too easily. That should be looked into.
But ‘metadata’ doesn’t have any Fouth Amendment cache anyway, and shouldn’t IMO.