BUGGI, I think that AMD is in a position where they can grow, simply by filling segments where they have almost no penetration today. They did this with Dell already and grew units handsomely.
However, you should not expect Intel to just let AMD gain share without bounds. 25% of the market may be a good equilibrium point for AMD, especially if Intel is content in the growth CAGRs that they are still seeing in the mobile space. However, if this growth slows, I would expect Intel to leverage their huge pricing advantage to gain share back from AMD.
Looking at the gap between Intel's mobile pricing and AMD's, I'd say that Intel has a lot of room to lower prices to compete for share. But I don't think they will do this, as long as they continue to grow in this segment.