I was planning to sell my 2015 MacBook Pro to fund a new gaming laptop, and thought the value was going to drop after Apple announced the keynote. Now that they've eliminated every USB 3.0 port, the SD card slot, the (relatively) standardised SSD, and keyboard with actual travel, I don't actually think the value will depreciate too much.
That being said, even after they've horribly damaged its appeal to Pro users, it will still do well with casual buyers. It's a a further refinement on what makes Apple's laptops so successful with the average consumer- it's stupidly thin, the display is gorgeous, the trackpad and keyboard are top notch (seriously, dat trackpad tho) and the combination of processor and SSD give the impression of speed for casual tasks despite the fact that anything intensive will make it keel over wheezing. The price is downright stupid, but there will be people who buy it, because it's the newest MacBook.