> The third party doctrine also basically legalizes most types of search through people's "cloud data"

This isn't actually true (it varies by type of "cloud data", like content vs metadata, and the circuit you're in), and there are multiple recent carveouts (eg geofence warrants) that when the Supreme Court bothers to look at it again, suggests they don't feel it's as clear as it was decades ago. Congress can also just go ahead and any time make it clear they don't like it (see the Stored Communications Act).

It's also, just to be clear, an invented doctrine, and absolutely not in the constitution like the fourth amendment is. Don't cede the principle just because it has a name. Technical and social solutions are good, but we should not tolerate our government acting as it does.