Yes, the Internet was originally a network to join computers, and worked on the assumption that all were implicitly trustworthy. Nothing can really change that, all is just going to be another layer on top.
That is why Telcos still offer ( at a real ruinous price, they hate the 5 nines reliability they have to provide with this which means dedicqated techs in the areas just in case, along with a lot more equipment redundancy over the current IP "best effort" approach) dedicated lines, with data travelling over internal Telco switched packet networks, with guaranteed throughput and multiple path redundancy along with automatic failover to the redundant path on error. We just last year turned that off, and I still have the old packet switches and router in my office to tear down, Not much call these days for a 56k link, but it was secure, and was perfect as an email link from our ISP and a connection that would almost never go down for support to work through.