WOW! A whole four USB drives and USB-C to USB-A hubs

I'm glad you can find them in a store near you, but they're not near me and most people aren't going to search for them on Amazon. Moreover, their design is horrid and my drives were the fastest type-A drives on the market as of the end of last year. Transfers are near instant--no need to relate them.
Where are all the hard drives? One NAS? Until USB-C is built into more external hard drives, Apple's direction is foolhardy, economically and environmentally (yeah, let's throw out viable hard drives /s).
And those cables all require dongles. Just a reality check, but have you ever run this idea by an average person and asked what they think? I love technological advancement but change is received best when it is gradual.
I haven't seen any PS/2 ports in anything recently manufactured. VGA is no longer supported by Intel, but there is still a lot of VGA equipment in the business world and it will only disappear as it ceases to function or as the abilities of other technologies become more appealing. Sorry, but this business world requires profits, not the latest tech.
Nah, that's an argument from silence. Neither you nor I can prove nor disprove it.
Actually, I use TB DAS with my Mini Server, but I won't eschew upgrading to USB-C/TB3 because of it.
I think the big issue which divides people with regard to an all USB-C MBP is simple: does that person think such a radical shift in design is necessary to facilitate an increased rate of adoption for USB-C or does that person believe a more gradual transition would accomplish the same goal?
Profiting from sales of adapters is a by-product of the radical change and while it may or may not be a driving force in this decision, it can only bring smiles to those who sell such adapters.
Left unmentioned in most discussions is the environmental impact of needing adapters, in terms of raw materials now and e-waste later. If nothing else, a more gradual transition may be more environmentally friendly, but that is beyond my personal ability (or anyone's) to foresee.