The 50 a side game will survive at international level - it is still more evenly balanced between bowlers and batsmen.
The world cup down in the West Indies was poorly organised. Stretched over far too long a period and inappropriate ticket pricing for the locals both can be improved upon. Cut down the number of second stage games, be prepared to play them simultaneously (a smaller number of hosts will help too).
Losing India & Pakistan early on didn't help matters, and if Australia's new side is not as effective as their recent one the result should be less predictable.