You should be thankful that AUS got knockout, easy SF to India, you will not get BD in SF that's for sure, but sometimes that happens too, like 2007 or 2003 WC, when Kenya was in SF...
WC format is not that different in knockout stages, its only three matches. Most difficult team to beat this time around and in 2019 probably will be ENG (maybe AUS, but Strac is not guarantee, he is so important to AUS chances), India's bowling quality is still not there outside of Asia, I am not convinced they can win a tournament outside Asia...
Reason for our success was powerous of our bowling, knocking down top 4 opposition to less than 230 is no joke...If we have to do well in 2019, bowling again will be the key, Pakistan has more variety then even most western nations forget about Asian...Amir and Hasan are top tier fast bowlers, Amir is very familiar with English conditions, he would have more experience by 2019, Hasan is getting county contract too, that is even better for us... Who knows we may sort out batting by 2019. Raees, Shadab, Junaid or others will get better, Pakistan has variety and quality, that plays vital role in winning tournaments in west...Azhar (our coach) is very experienced in English conditions, that's was and will be great help...
At the end bowlers win you tournaments, specially in West. Pakistan has won T20 WC, CT and WC finalist in England only, not to mention 3 test series wins and a drawn full test series just last year, where nobody was able to win or draw series in almost a decade...
All signs are there that we will be force in WC 2019...Obviously, no team in like AUS of 2000 to guarantee WC victory, but we are right up there with rest of the favorites ATM, 2 years is still a long time, but its hard to get a world class fast bowler or even a spinner(although they won't be as important) in two years, whatever teams got is most likely will be in 2019, that's another plus for us