I still like the idea of converting the estate tax to a cumulative gift tax, with the first $2m of gifts received free of gift tax, then next $2m at 25%, then next $2m at 50%, then 75%, then 100%.
That would break the aristocracy of self-perpetuating fortunes, as marginal income taxes even of 90% at their height in the US never could. I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.