You are right that Pakistan success depends on their confidence as they are talented but mostly inconsistent team. India team is indeed very balanced and strong with history of great performances and recent World Cup win. But Rohit Sharma has retired from T20 cricket India still has plenty of high quality players. As for Sri Lanka their recent struggles show they are in rebuilding phase and Bangladesh uphill battle to compete at highest level due to their lower ranking. And good analysis you captured key strengths and weaknesses of these four teams.
I think that is best time for all teams to show their abilities as they could make good team at that time. Bangladesh many senior players are retired and now they are very weak team but Bangladesh cricket team played very well against Pakistan cricket which shows that, they have no fear to play against Pakistan cricket team as they won many series against Pakistan but in the past , Pakistan team had great confidence to win against Bangladesh and we saw exciting matches but Pakistan cricket team was the winner of these matches. India team has exceptional performance and no team is alternative of India because they are qualifying in the final in the most of the tournaments and they won last World Cup and Pakistan team performance is very poor in last tournaments.