if people are too lazy to use curses which is cross platform, why would they use your cross platform library?
Curses needs initialization (and cleanup). Granted, it is not very hard, but with this you can just swap conio.h to rlutil.h and kbhit() / getch() / gotoxy() based game is now playable on Linux too (or at least very easy to port if other Windows specific stuff is used.)
I would still recommend using curses (or more specifically, ncurses / PDcurses), but this library has its uses for easy porting of existing projects and rapid prototyping.