The JD/MBA in me must, in all fairness, put a more naked capitalist spin to the whole thing as kind of a cautionary tale.
One could look at this as a risky thing, but note that the 2 major comic book companies do something like this. Whenever the smaller comic book companies started eating into Marvel or DC's market share, those 2 companies would flood the market with additional titles. Like the car manufacturers, soft drink companies and others who do this, its about controlling the market by limiting the growth potential of future competitors. After all, the single biggest factor in succeeding in a particular business is being first to market. (Yes, there are other important factors, but being #1 is a HUGE advantage.)
If WotC/Hasbro were to start digging into its RPG vaults, they could not only find the various D&D editions, they'd find titles like Everway, Amazing Engine, Boot Hill, Gamma World, Primal Order, etc., not to mention the possibility they could do RPGs of some of their wargames or even M:tG and other CCGs. Each could be released with some kind of unique campaign world or 2, leaving fewer niches in which the smaller companies could find safe havens.
THAT is the potential downside of Hasbro throwing its considerable weight around in this particular playground