I disagree. A yuan-ti abomination couldn't walk down the street in old FR without havoc ensuing. A lizardman would draw a crowd or maybe fleeing onlookers, and probably the watch. A drow would have to keep a very low profile as well (usually stay hooded). Not even D&D logic is with you on this one.
WOTC can change this, but I think it's silly of them. It's too wahoo for the implied setting of D&D for this to be a core PC race, IMO.
True. Also, if lizardfolk is so integrated, then that also changes the whole dynamic of the setting. It gets more Sigil, less "calssic D&D fantasy world". And invariably, the more common exotic stuff like lizardfolk is, the less exotic and special the rest of the world feels. I don't really like this - I prefer to play in settings where society is not generally as cosmopolitan as in Sigil, and where sigil is the exception, not the norm.