I reckon no because:
(a) primarily, a different genre with the Halo branding would get more sales - a TPS with Gears elements or a sandbox with Crackdown elements, for example, would for sure hit 2.5mil.
(b) and... what could you really do new in HW2 that would make it a substantial step forward?
This said, however, if Microsoft could get Robot w/ a few MS Game Studios employees to knock out a sequel on a small budget, then it would definitely be worth it, since even an unambitious sequel would break 1mil and thus, on a small budget, be pleasantly profitable.
So, lol, I guess maybe also 'yes' then. Who knows? XD







