I would buy new monitor, but only if they would release 4k display with 3840x2400 resolution (16:10). I like my vertical space. More lines of code visible, I find it very useful.
While custscenes are simple, the numbers Casey adjusts for placement, camera movement and speed are very tied to visible area on screen. Sure, while 16:10 is not that different from 16:9, it sill must be handled. It could be much worse on monitors with 5:4 (1280x1024) or other "ancient" resolutions :) But I guess that is not a priority for HH.