So reading all the comments I see that most "against" are because "Because if everyone used SQLite there would be no second implementation, which is something that is necessary for a proposed standard to become an actual standard."
WTF? Do we need to implement MySQL, PGSQL or MSSQL to get a chance of having SQL in our browsers? Does that sound stupid only to me? Is Mozilla trying to follow the "success" of IE? Who pays W3C? Why do they play like the God of Web? And why can't we have both? I certainly don't want to ever use IndexedDB if I have and SQL option.