That's true, but what I often here from people when it comes to phones is who cares about games? In other words, as far as becoming a major player games are not really the main determining factor. As long as there are some decent games apps, the usual solitaire, defense type games, etc, then it won't be a major issue. More important is stuff like cloud, tethering, choice of real keyboard or no keyboard, stability, etc...
In my case I have an iPhone currently and I do have some games on it. But issues like no physical keyboard, no tethering ability, no multi tasking, atrocious iTunes, etc, are pushing me to other phones even though I know there won't be as many games on it.
Having said all that, if games do matter significantly then ironically MS waiting so long to bring out a good phone could be a big advantage as their base spec should be really high, so all games will support it compared to say iPhone where 3gs is rarely supported on games.