A lot of the younger fans on the forum had very unrealistic expectations of the BD cricket team, whereas the older, more mature and more cricket-educated members had their feet on the ground.
I believe anything is possible. BD beat New Zealand, South Africa and India in the past month or so and by 4 years they will be far stronger and will be able to beat these teams on a more regular basis. However the Ozzie dominance of world cup cricket is truly awesome and it seems like they are unstoppable in this world cup and perhaps maybe even in the next, who knows.
So in other words if our cricket team can beat South Africa, India and New Zealand in ODIs (though all 3 of those teams are better than BD) then not only can they do that in 4 years time, they can do it more regularly and perhaps get to the same level as Australia.