The coming dialogue in Syria

The Syrian opposition will not participate in any dialogue or even negotiation with the government. I mean here which is backed and supported by the west.
It is not preferred even by Syrian to be part of the wide national dialogue. This opposition is formed from a mixture of sectarian powers in addition to some extreme leftists who are trying to gain money and power.
Any dialogue with those people means automatically their participation in the consequent government and even being part of the ruling system of Syria.
The most dangerous thing for Syria is bringing those people you to the government. their destruction of the nation will be from inside the government . It will be difficult to throw them out as their legitimacy is coming from the dialogue which will be monitored by the world.