What does Gita say about incarnations?

Lord Krisna clearly states in Gita that whenever there is adharma predominating on the dharma and the dharma in intself isn't able to fight with adharma then I appear and stand by the side dharma and help it to conquer over the adharma...
                     .yadä yadä hi dharmasya glänir bhavati bhärata
                    abhyutthänam adharmasya tadätmänaà såjämy aham..B.G.CH4 SLOK 7


                       pariträëäya sädhünäà vinäçäya ca duñkåtäm

                   dharma-saàsthäpanärthäya sambhavämi yuge yuge .B.G.CH4 SLOK 8

But these slokas doesn't mean that God appears in the outside world. Whole of Gita is concerned only with our innerself. The yudha/war that is going on; the incarnation of God is all happening or happens in the innerworld of the yogi. The yug here doesn't refer to satya,treta, dwapar and kali or any other yugs but the yugas occour in the inner-world of the yogi. To understand this concept more clearly he states in the next sloka itself that only tatva darshi are able to see me with their eyes. 

                 janma karma ca me divyam evaà yo vetti tattvataù

                tyaktvä dehaà punar janma naiti mäm eti so ’rjuna..B.G.CH4 SLOK9

So it becomes clear that if there was actual incarnation everybody on earth could see it. But only tatva darshis are able to see me. Because my incarnation occour in their heart whenever they cannot cut away from illusionary world and adharma(like kam,krodha etc..).Lord Krishna says the same thing for other Gods also. According to him there are no such thing as god.There is two things that is true- one is atma and other is paramatma...om tatsat..