It's not necessary. What one needs for messages? Normal, bold, italic, pictures, links, quotations, and files uploading (existing already). Many BBs have less than this. What else? The message to sing, dance, move, jump, cry, laugh, ding-dong? :) This is not a BB already, this is an overburdened web page. This is a TV show! Such things are to be done with Dreamweaver and FrontPage, not with a BB.
Well, may be colored text and sizes, and that's all. Not even left and right text, because the users of a BB usually are not competent enough to use it.
The BB Codes have one unique advantage - they are manual and the writing people can control what they want to appear in the message absolutely.
As per the not reading and not writing lazy teens that cannot write their names and to remember 3-4 BB Codes, if that's so, than it's not sure that they couldl write something with 2 grams of sense in ANY BB.
Finally, the simplest things are the best and surest ones.
My modest opinion.