Quite simply: most people are completely clueless of hardware and software. They simply use whatever comes with it and stick to that. This is a big problem for manufacturers because people won't move to new ports. This can actually increase the manufacturing costs as well as material cost and thus create more expensive products. In this case we are talking about a universal connector that can be used for USB2, USB3, USB3.1, Thunderbolt, DisplayPort, etc. That means that a manufacturer can buy in more quantities and thus get a higher discount. Or simply put: it makes things cheaper for them because they only have 1 connector. Look at all the products at CES 2016 and you'll see that manufacturers are well aware of this and already ahead of the game. You want people to use a port, you not only need to start putting them on devices but they need to be the only version on the device. You have to completely replace the old with the new because if you don't people will stick to their old stuff and keep the status quo. That's what I meant with "USB-C needs to be the default ASAP and the industry knows it.".
Very few new notebooks still come with a VGA port because for the same reason why the MacBook only has 1 USB-C port and because the MacBook Pro has Thunderbolt: the target audience wants it. The notebooks with VGA are business notebooks sold to businesses where you can still find a lot of VGA projectors. It is on the decline because of DisplayPort++ ports (these are multiprotocol ports that support DisplayPort, DVI/HDMI and VGA) where all you need is an adapter. This is common practice with Ultrabooks. Also the use of wireless technologies (AirPlay, Chromecast, ClickShare, etc.), HDMI and displays instead of projectors contribute to this decline. Most people don't care for any other port than USB on their notebooks because all they do is connect their external drive and mouse to it (if they still do this and not have moved to cloud computing and a bluetooth mouse or just the trackpad). External displays are hardly being used, it's almost exclusively seen in the business world and some hobbyists (most people have no clue about ergonomics either or it is simply too expensive).
Obsession? No, it is just basic knowledge of users, manufacturers, USB and the IT world as well as simply taking a look at what manufacturers are currently offering or going to offer this year. Like I said, look at the products at CES 2016, look at the current notebooks (both offerings as well as sizes...where would you put ports like VGA and USB-A if you also want to include something like USB-C), look at the sales numbers for notebooks vs desktops (desktops are the only ones big enough to have enough physical space for all those ports) and by all means look at things as they are. Manufacturers want to sell their products, they have no interest in you still being able to use your old USB2 stick. They are a company and thus have to make money in order to survive.