The KDP, led by Barzani, and is the largest party will use the renewed call to consolidate popular support as it seeks to sideline the other parties. Barzani will also see this as his opportunity to get his name in the history books as he nears the end of his career.
The PUK is also pursuing a long term agenda of independence, but its support for this referendum will be driven by a desire to win back votes after losing seats in September 2013.
Baghdad knows that it will be powerless to block the referendum, and in the lack of a better solution, Abadi will likely look to seek a negotiated outcome when independence talks begin, which will be to the annoyance of his government and rival parties. Iran and Turkey will also fear the resurfacing of this topic as it will ignite renewed calls for independence from its own Kurdish population - for now, this will be partly contained by Turkey having full control over the export of Kurdish crude through the Fishkabour-Ceyhan which runs through Turkey. Kurdistan is also exploring potential export of oil through Iran to diversify its export options, so Iran is an ally for Kurdistan to keep onside for now.