MMP has already published scenarios in a number of these time frames. I'm a big fan of SCW and Sino-Japanese scenarios. I'm always glad to see WWII-adjacent scenarios, and I hope MMP keep publishing those, but I think taking it to Korea and now even beyond that goes too far for me personally.
Given that I'm not made of money and that I'm running out of brain capacity for remembering a lot of rules like "New Terrain Type: New Terrain is treated exactly like Old Terrain, except where stated otherwise," I have to draw the line somewhere. I'm leaning toward not buying Korea, and definitely am not interested in post-50s or WWI stuff.