I don't think pressure played a part in their loss.
Quite simply they were over-reliant on 2 batsmen, whilst the others simply weren't up to the job.
Yup pretty much.
And both Rohit and Kohli got great balls.
Rohits in particular was a peach and one can't blame him for getting out to such a delivery.
Kohli always has been susceptible against left handers bringing ball into him at start of innings. He practices very hard in net with jadeja bowling him chucked deliveries thrown with a sling. That makes Kohli adjust to the angle of left handers. It helps him to leave delivery outside off stump and be sure of where to play and leave deliveries of left hand bowlers with that angle.
However these slingshot deliveries can't help Kohli to practice against balls coming in late. I don't think there's any technology to practice against such deliveries. Most batsmen are susceptible to such deliveries and that's why Wasim was a top notch bowler. The only way Kohli can get used to such deliveries is if he plays county cricket at top level and practice in swinging conditions in nets against bowlers with capability to bring ball back in to him late at decent pace.
Unfortunately that won't happen so Kohli will always be susceptible against such balls. It's all about first 7-8 overs. If Rohit didn't get out in first 7-8 overs then Kohli would have won us the match because his weakness would have been nullified once ball becomes a bit softer.
Won't blame Kohli and Rohit for their batting the blame should be on captaincy, management, selection, planning for the world cup. In world cup you can't play just 2 batsmen and expect to win. So we didn't deserve to win.
But nothing will change, BCCI will hire couple of series against SL or WI. On flat tracks players will boost their stats and fans will forget and media will hype the players to be the best in world. Advertisement companies will start milking money again using this media hype.
This is how Indian cricket operates in a nutshell. India as a country is run on emotions more than on PPP (planning/performance/professionalism).