"There are many things I'd say about or call the B-58, but monstrosity wouldn't be one of them ("deathtrap" would be appropriate - the accident rate was horrid)." Common misconception about the B-58, if you take away the accidents in development (not unsurprising for such a quantum leap in technology), the accident rate was perfectly acceptable.
The aircraft could and should have continued service well into the 1970s.