I kind of what them to come up with a different overall title.
the original trilogy should be Halo, because it's about the rings. the others should have different titles. so it would be (insert title here): Reach, (insert title here) ODST. we dont know what Halo 4 will be about yet, but if it's about the rings then it would become (insert title here): Halo 4.
I'm split on this because I don't completely want this. I see why it is the title other than it being the name of the first game. the forerunners killed themselves and the flood with them, the covenant enter the great journey from them, flood were released again on them, they changed the tide of the war.
It's seems like a kind of a good idea to me, but it also dosn't seem right to chnange the name.