A bunch of rich people with no real military protecting them will be like ripe fruit for the picking (as they have been over and over and over for centuries).
Not really no, for example during the French revolution which supposedly directly targeted the wealthy, the majority of those that went to visit Madame were not nobles.
I'm not entirely sure what the fixation is with income equality anyway, shouldn't people be thinking more about a continually improving standard of living? I mean surely that's what matters most to almost everyone. I know I don't wake up every morning bitterly jealous that someone else is richer them myself, or upset that I can't buy a Lear jet, seems like a pretty sorry way to go through life.
I don't have a problem with people being richer than me as long as they aren't using their wealth to fuck with people, like the banks did with their artificially inflated property bubble. Yes, when one party is providing 90+ % of the price for a good or service, that party controls the price. So, fuck the banks basically. But not due for ideological reasons.