No. The initial question is loaded, or too easy to quickly attack after an abrupt response. It's no more useful to me than asking what amount of taxes is too little for the rich to pay. Obviously zero is too little and 100% too much.
The fact of the matter is our system is currently structured in every imaginable way to benefit the merchant class. Obama's stimulus was specifically designed to save businesses from failing demand, and outright giveaways to others. (Now Republicans want to come after the middle class...oops I mean "broaden the base" to pay for the debt created to save richie rich's businesses?) Federal Reserve policy is highly beneficial to those it lends to. Our social safety nets are pass through programs where fungible money is taken from the middle class, given as welfare, and spent on the products produced by the rich. We have the M.I.C., P.I.C., EPA over regulation pushing new competition out, tax advantages for big business financing that isn't available to the small start ups, Mega Ag. sucking billions up, utility monopolies, duopoly retailer structure... Capital is taxed at 15% before write-offs; my wages at 15.3% in FICA & SECA alone.
I don't know what the optimum amount of taxation is but I know it is much higher at the top under our current system. Also, if you want to see reforms to the bloated welfare state then make the rich pay for it. They're the ones buying off congress and will fix the damn problems if we start sending them the bill.