I have to disagree with you, loudly.
First, have you ever had to find a fix a memory leak? Thought not. A company could spend the profits from the next game paying for the effort, especially if the developers are unfamiliar with the code. Second, is it NOT a major bug. One sees it occasionally after playing a very dense games for a long time. And it is recoverable.
The graphics bug is *not* new. It has been around as long as there has been a Windows version, AFAICT. One typically encounters it if the screen saver kicks in while in GCII full-screen mode. alt-tab usually still works if you do it before playing any turns in the session. It is possible to continue from the "text graphics" mode: ctrl-esc to the desktop, then focus back to the game. The screen will be black. If recovery is possible, the display will restore after a rather lengthy wait (maybe a couple minutes). Immediately save and restart, as the next "glitch" will probably be fatal. This bug has some aspects of a memory leak, too, as the longer you play the less likely is the possibility of recovery. Also, it may not be an in-game bug but one in the old graphics system support that the game uses.