Effect? On the company? Over a recall like this? Please, the stated "defect" is that the pressure cap can pop off and hit you in the face if you unscrew it too fast when there is still pressure in the tank and that if you stand under the plumeting mylar "rocket" it can hit you as gravity draws it inexorably back to the cold embrace of mother earth.
What will happen is this: product still in the distribution chain will be returned (that will cost a prety penny but probably not too much) menawhile nobody will return product already sold because no consumer knows or cares about most recalls unless there is something catastrophically wrong with the product (ie: explosions). Just a quick glance at the US Consumer Product Saftey Comission website (took me 30 seconds) shows that
eighty four ( 84 ) recall notices were issued for toys or childrens products in 2002! How many of those do you remember?

Heck, Hasbro has 16 recalls posted on its website
right now. Hasn't hurt business so far. At worst if one of those parents whose kid got stiches decides to sue Hasbro will settle out of court for $10k and admit no wrong doing and then they will make the payoff disapear in some tax code and never feel it at all. As far as PR goes, why do you think they issued the recall in the first place? I mean, eight reported injuries (all of which sound to me like user error) is not a public health concern. Issuing the recall gets them out in front of the issue not only for legal purposes but also gives them something to point to and claim good corporate citizenship.
And even in a worst case scenario this could never effect WotC. The entire point of subsidary companies is to insulate one company from the screw-ups of another (well, and making a lot of questionable tax and accounting practices easier, but we won't go there

). Seriously guys, lighten up. The three mega-corporate overlords who rule our world have little stuff like this well in hand.
Later