Problem for Bangladesh is that its usually one step forward, two step backs. This WC however, it was just two steps back. Practically no positives to take out of this - their batting was inept, only two batsman are what you would describe international class and with the next WC in Aus + NZ, their seamers need to come on and the sides culture needs to change. They had a slow, low wicket yesterday, where they could get through 40 overs of spin yet they still ended up losing by their biggest margin in terms of runs in a WC game.
I don't think it's been a complete disaster from Bangladesh. They beat the two teams they were expected to beat and also one of the teams above them ( I know WI were below Bangladesh in the rankings at the start of the tournament but in real terms they are a better team). They would have took that at the start of the tournament if given a choice and only narrowly failed to qualify for the knockouts. I think you can call that a positive.
The negatives are obvious; the manner of the three defeats, all three being huge which meant they failed to qualify, losing out on NRR.
They lost their heads in the defeats to WI and particularly SA, where in the latter game I think the batsmen knew that the game and thus the tournament was over for them after the first couple of wickets.
This mental side of the game is where Bangladesh lack severely in comparison to all the other teams, including Zimbabwe and Ireland. The main reason for this is that the average age of the squad is 22/23, the youngest side of all the teams and I'm guessing by a wide margin. Some of them may have played many games but at the end of the day they are still "kids" relative to opposition players. They lack grit, determination, composure, guile etc.
The reasons for this is twofold; firstly a lack of quality coaches at youth level, and secondly a poor domestic league. At u19 level (and below) the players are competitive relative to the youth from Test playing nations but they don't progress and develop like the youngsters from the other teams.
When they do make it to the national setup, often many of them have to be taught basics and have their techniques corrected by the national coaches because of the lack of previous quality coaching. The national domestic league, while it has improved in recent years, it is still poor in terms of structure and quality of players compared to others. This is a big advantage Irish players ( and also Dutch players through Kolpak) have over the Bangladeshi players, as they have access to County Cricket, which can be a huge factor in the development of a player.
So, what's the outlook for the future. Well they have to keep the core of this team and add the best of the promising youngsters. Keep the likes of Shakib, Tamim, Razzak, Shafiul, Rubel, Kayes, (Mahmadullah and Mushfiqur only for Tests, and competing for top order in ODIs). Add to that youngsters like Jahurul Islam, Nasir Hossain, Mahmadul Hasan etc. They also need to separate the Test team and the ODI team, some players are clearly not suited for ODIs but are for Tests (Mushfiqur, Siddique etc). In conclusion Bangladesh are still a work in progress, even after all these years, but one day we will get there. Amra Korbo Joy (we shall overcome).