All tax laws and tax policies originate in the House. No President can issue an Executive Order affecting tax policy. If one could, what would stop him from issuing an Order to make the current tax rates top out at either 65% or 15% depending on who was President?
Obama cannot carry out this scheme without a compliant Congress.
Obama won't get a compliant House. But he will test many proposals like this one against them and look for one with some traction and hammer it through with RINO support. I doubt this would be the one. But people should not underestimate the power of his class warfare message and his charge that Republicans are trying to "crash the economy". The issue he picks (maybe tax increases or a new federal financial authority) will be chosen to be both "unless you pass this the markets will crash" and "not passing this will only benefit the rich". Then he will get the compliant media to play those messages, engineer a market crash if the House votes it down, and ram it past the RINOs. It will actually be quite easy for him, although he will only be able to do it once or twice at most.