They used to be one with something like 70-80% market share. Being number 3 reveals they have lost a huge %. At best they may have 30% but D&D has always been ahead by a large %. 2 years of no new product is actually a worse situation than the interruption caused by the TSR collapse and the WoTC buyout at least in terms of new product.
They had a 70% market share for a specific three month period when they released probably three to six titles during that period to actually sell. Why you would expect that 70% share to hold even when they have nothing on the market is beyond me.