None of which have made the slightest difference, in fact the violence has escalated out of all proportion, even to the extent of the shooting down a plane of a neighbouring nation in the full knowledge that no serious steps will be taken against the Assad regime.
The few steps that have been taken have been cancelled out by the support he has been given by Russia, China and probably Iran.
If the UN does not act decisively its reputation will be left in tatters, leaving the door open to other despots - Bahrain for instance (you remember Bahrain - the feudal dictatorship Britain tried to sell weapons to within weeks of the Arab Spring disturnbances breaking out - Cameron described opposition of such sales as "racist")
On top of this, the present inaction has pushed the victims of Assad into the arms of the religious nutters - as has happened in Egypt (remember Egypt - the country that the US was selling arms to to be used against protesters).
http://presstv.com/detail/214439.html   
Whatever excuses against intervention, the Brit. one (echoed by you) of not intervening because of the possible political implications of who will replace Assad, probably being the most murderously cynical, all this is opening an extremely toxic can of worms, and rather than encouraging a move towards democracy, is pushing the Middle East from one extremist dictatorship into the arms of another.
Jim Carroll