I think people are overreacting to the whole "CHA 8" issue. It's only marginally below average, after all. I'm sure a lot of fine adventurers have a low CHA stat.
Turning away people at the gates. Maybe if they were CHA 5 or worse. And only maybe, even then.
If you want to remind your players why CHA can be important, there are easier, and more sensible, ways to do it. D&D has skills like Bluff, Diplomacy and Gather Information for a reason. Use them.
Your PCs want to put some bounty hunters off the scent? Bluff check. They want more gold for their latest quest? Diplomacy check. They want to find out some information about the old mines? Gather Information check. It won't be long before there is at least one "face man" in the group.
CHA is only a dump stat if the DM lets it be one. If STR is ten times more important in the game than CHA, then STR gets the high stat. If a DM wants some high CHA PCs, he needs to give them the chance to shine.
Oh, and hong's CHA-based feats? Very cool.