Considering Demon's Souls could manage 1.77m on PS3 as a complete unknown at launch I dont see why Bloodborne cant go on to sell 2.5m, especially when its your biggest game for the first half of the year.
Edit: Also that DkSII number is still on the rise, not only are the PS360 versions still selling but a PS4/XBO version are on the way in a month.







