DPS will even with the new terminal renovation and expansion reach their max capacity within 4 years...especially with the ASEAN free zone and stuff and the middle class in uprising and the growing micro economy.... But they are planning to construct an airport in the northern side of bali! So it will be better to divide the flow of passengers. However i've got my doubts if people are willing to go to the northern airport. They can make it better like an regional airport with an runway of max. 1600M, suitable for atr's and other small planes (less than 80 pax)
If they want to utilise the maximum of DPS airport, they should extend the runway to 3600M and connect the airport with an MRT/monorail/tram to reduce the worsening traffic jams and connect it to DPS/kuta/legian. I can tell you as a half foreigner that tourists want no stress and a lot of conform and they are willing to pay a bit more if they can reach their destination very quickly without sitting in a cab for 30-45 minutes. It will attract more tourists and it will give a lot of benefit to the local people as well!