well it will depend on differents matters
1 - Games & tiers supports
2 - price
3 - power
for now we dont know anything !!! It can be the next GC (25m) like the next Wii (87 to 120m) or a "flop" like the DC (10.5m)
actually the market is much stronger (vs PS2/GC era) so it probably will be between 50-100m







