I don't think this 336,000 units in the pipeline is something MAS will be so irresponsible to plucked from the thin air.
We all know that within MAS and all the GICs, among them, they have an army of researchers, economists, planners and whatnots and there may be many things they know and the public don't.
The proposed Peter Lim's RM10 billion Vintage Bay, CapitaLand's RM3.2 billion proposal in Danga Bay, the later phases in Princess Cove, Greenland's RM3 billion Tebrau Bay Waterfront City, the huge Country Garden's Forest City in the west.............off hand I can already name some massive projects "in the pipeline" and there are several others!
Some slowing down is obvious right now given the slow take up rate in 2014 and 2015 as reported, I guess many projects may just as well be frozen till later, perhaps till very much later.