Will Syria use Sarin Gas On it's Own People?

Is Assad getting ready to use Siren gas on his own people? This is the question that weighs on every ones mind today. President Obama warned Assad and said ' I want to make it absolutely clear to Assad and those under his command : The World is watching, The use of chemical weapon is and would be totally unacceptable and if you make the tragic mistake of using these weapons, there will be consequences and you will be held accountable.'

Why raise the bar to the use of these weapons? On Monday alone 300 people were killed according to human rights observers. Isn't it enough that he is killing hundreds of people every day, now the World will wait to see if he will actually use these weapons? We have removed dictators for lessor of crimes in the past so why wait on this one? Any thoughts?