They are only stable because we are still getting cube income. Since that income has nearly all gone and no other products announced, dividends could shrink nastily over the new year period.
I'd wait for an announcement from fc to clarify if more cubes are being produced or any other products being launched before gen3 to keep divs up but the waiting is more torture than its worth.
There were 9000 cubes, which are currently sold for 1BTC a piece. Let's say reseller has 5% profit margin, this leaves 0.95 for asicminer. Hardware sales in last two dividends were around 716 BTC, which equals 750 cubes. There is still A LOT to be sold.