I'll bite and lay out why I won't be buying a new one (soon). Perhaps in a few years once everything else moves forward:

MagSafe:

I have three 85W MagSafe adapters. Replacing these would cost an extra $200 over the cost of the machine. I have four kids, two of which are toddlers. Sometimes I am working somewhere not at my desk and the cord gets pulled or tripped on.

TouchBar:

About 70% of the time I am at my desk using an extra Apple keyboard and magic trackpad. There is no option for an external Touch Bar. I'm not going to get used to using a feature only available to me 30% of the time. The price difference of the Touch Bar appears to be about $300 (comparing last year's model and the 13" non-Touch Bar to the Touch Bar model). That is a lot of money for something I am not going to use.

USB-C:

I don't really have a problem with USB-C (other than losing MagSafe), but it does mean buying new cables and some dongles (~$80 in my case). However, the big issue is that I spend 70% of time at my desk with my power, 32" 4K display, headphones and lighting cable (trackpad changing and iPhone) plugged in. Currently these can all plug in on the same side of the device. On the other side I have a USB port and SD card reader for those occurrences I need it. This leads to "docking" and "undocking" being straight forward, and a clean and tidy desk. With the new MBP I would have to have cable plugging in on both sides of the machine. My desk is small enough that this would lead to cables hanging off the edge of my desk, which would lead to things getting tangled and generally messy. The other option would be to drop $250-$300 on a Thunderbolt 3 dock and stash it all behind my monitor. But that just raises the price even more.

Physical Size:

I don't need a thinner computer. The case I need to protect my laptop is far thicker than the laptop itself. It doesn't make my life better in any way to have a thinner machine. It would make my life better to have the same thickness with a larger battery.

Ram:

I do cross-platform development in C++. I am building and testing GUIs on Linux, Windows and macOS. Having extra ram to throw at my VMs would be great. Being able to have my four primary development VMs running with adequate ram and being able to boot up another VM to debug an issue in another OS version would be great. 32GB would be nice, but 16GB will be just fine. If there had been a larger battery instead of a thinner case, maybe they could have allowed another memory controller…

Summary:

I was planning on spending $3200 on a new MBP because there was need for a new machine in my household. I could use to upgrade storage from 512GB to 1TB. The extra CPU bump for compiling would have been nice. The improved screen sounds great. However, with the addition of the Touch Bar and new ports, the ergonomics are reduced (cables on both sides, plus dongles), and the cost would now be at least $3700. With tax and AppleCare this is pushing well over $4,000. But in the end the improvements for me would be a faster CPU, larger HD and nicer screen. the downside would be messing up the ergonomics of my setup, and making my machine more prone to damage from falls.

Maybe in a few years once there are more significant improvements in the internals, and there are more displays providing TB3 connectivity, I'll feel the cost is justified. For now, the loaded previous model is available as a refurb for $2600. I won't need any new cables, everything else in my setup will work with it, and I can get a faster CPU, GPU and larger SSD. The main thing I will miss out on is bump in GPU and move from Crystalwell to Skylake. I'm willing to sacrifice that for $1100.