[quote name=\'chris319\' post=\'222505\' date=\'Aug 10 2009, 05:14 PM\']Was Barbara Feldon the one who prematurely offered to take the place of D.K.?[/quote]
I'd never heard that, though I had heard the speculation about Bergen and Adams. Plus, "Line fans on Usenet" would pretty much be US back in the day, wouldn't it? I mean, there wasn't an alt.tv.whats-my-line. We never spoke of it as I remember, and a search in the old group doesn't turn up her name.
Feldon hadn't done the show (and wouldn't even be a mystery guest until 1973), so it sees even more out of place for her to have make an out-of-nowhere request like that. Finally, and probably most importantly, Get Smart had only been on the air for two months when Dorothy died, so Feldon was hardly "very large in television" at the time.
EDIT: Plus, you know, what Curt said.