Ok, I expect reach to perform like Halo 3, so based on that here are my thoughts on the games listed. (all based on sales, as you really can't fairly compete in any other way). Also, if he is talking America only, then there really is no competition.
1) yes - the series is doing fantastic (even WWII versions), across all platforms (including PC) it should have no problem. If we are talking consoles only, then it will be close.
2) no - the series has bombed and it would take a miracle for it to outdo Halo. Most people will probably see it as a ripoff of Call of Duty.
3) don't know enough about it to say either way.
4) probably not - New IP, GTA like game, while GTA IV did well enough (combined) to outdo Halo 3, why should this new game do as well as GTA IV? Most new IPs don't take off to the +5m range, so I see no reason to expect this one to.
5) no way - the best selling FF is just shy of 10m units. To top that off, most the japanese sales will be in 09, so it will have a major disadvantage in 2010. Also, due to the lesser performance of the HD consoles compared to the PS2, I expect sales to be slightly down. Sort of like GTA:SA compared to GTA IV.
now, as for other games listed above.
* GT5 - possibly, I expect around 8m, so it has potential. It really depends on if it ever releases 
* God of War 3 - no way ever. This game will top out at 3m most likely, just like the predecessors.
* Gears of War 3 - no again. 5-6m units, I expect Halo Reach to do better. ODST (the Halo 3 expansion as some call it) already broke 3m.
* Twisted Metal - 2m sales at best, if it even exists.
* Galaxy 2 - only if it launches early in the year like rumored and Reach launches really late.
* Wii Sports Resort - possibly, but it will be close. Wii Fit did over 9m, but got its legs cut out by Wii Fit Plus. WSR managed to maintain ~>200k every week so it has potential.








