You are correct the tournament now depends on who wins between Pakistan and Srilanka. Absolutely certain that Pakistan won't feel comfortable when they play with Srilanka. Srilanka knows that they have good spinners to tackle Pakistan batters. Pakistan knows they do not have excellent spinners to tackle the spinning pitch of Colombo. The way Pakistan batter played against the Indian spin attack has to be the tipping point for the management to reassess the current strategy. Overall they need to reorganise themselves to win the game tomorrow.
After watching them play against the Indian spin attack I felt Pakistani batters are vulnerable to spin bowling. They seem to not understand the pitch, I mean the team management. Why did Pakistan after winning the toss opt to bowl first? When they knew rain was certain. It could be that they became overconfident after the first match. Then we have the Captain who thought it would be safe to have a defensive fielding. Before the ICC World Cup, it is now evident Pakistan and Sri Lanka have to rethink their strategy for the upcoming biggest event.