So, he's wrong on objects achieving some platonic ideal form. Earbuds aren't going to make it another fifty years. There'll be hearing-aid-looking thingies, then implants, then god knows what. I think he's seen Galactica too often or something. The conceit there is that that world lead to our own. Ours...well, things are going to get freaky.
I disagree with that Smartphones are getting larger not smaller because most people prefer that from a user interface pov. Now personally I would disagree with that because I do not use a Smartphone as a computer replacement, but oh well. Can we make a Phone with he features of an iPhone 11 Pro in the size of a Apple watch a few years from now? Likely yes. Will we use that? likely no.
Roddenberry's novelization of The Motion Picture mentions that earth used brain implants to transmitt audio and video messages but they were banned since they were misused.