I'm more than ready to move on to this, and would have been ready years ago. In 1999, floppy disk use was far more prevalent than the need for multiple USB ports is now. For your described use case, you'll just plug your Macbook into a USB3 hub or dongle with HDMI (I don't think this machine has enough graphics power for multiple external screens). You will actually have fewer cables to manage.
And it actually would hurt the Macbook to include more ports. The current port is above the keyboard, likely because it can't fit under the keyboard. Adding more ports would mean increasing one of the dimensions. Given the versatility of the USB3C port, I think it's the best possible tradeoff. If you absolutely use lots of ports day to day, and can't use a hub, then this really isn't the computer for you, and Apple will even sell you one of those.
However, every day at work, I plug my MacBook Retina into two monitors, plug in my USB 3.0 drive, sometimes my iPhone to charge or do dev stuffs, and charger, and frequently use my SD card slot as a 3rd HDD. Apple now is in the business of offloading the problem of I/O to the user, they haven't fixed it. It wouldn't have hurt the MacBook to include 2-4 ports, all USB3c