it won't work for inter island cargo. You'd have to have roll on/off terminal facilities at Banyuwangi and Gilimanuk, plus new carriage capable ferries.
i can see great future benefit for an intra island light rail system.
Bali is growing fast. 10 years ago there was no traffic jam at Simpang Siur. Kuta to Tanah Lot was a breeze. You could comfortably cover Bedugal, Lovina and lunch in a day trip.
Look at the rapid villa expansion in the south, and the concomitant land price explosion. Locals can't afford it. They're forced to live miles away from employment sources.
What will traffic be like in 10 years?
A sobering thought. By the time the Simpang Siur tunnel and the mangrove tollway is built, traffic volumes in peak time will probably choke them.
Compared to 4 lane highways, light rail is cheap to build. It's dedicated, so there's no competing traffic.
Like it, lump it or hate it. Bali in the future will be an affluent, consumer society.
Infrastructure planning has to be for this Bali.