It is always easier to criticize and give opinions when it cost us nothing than just opening our mouths or type on a keyboard. Mother Teresa, Dalai Lama, Martin Luther, Gandhi, any great leaders of the world received numerous criticisms one way or another.
Abraham Lincoln supposedly quoted "You can please some of the people all of the time and all of the people some of the time but you can't please all of the people all of the time."
What the 14th Dalai Lama has done in handling the invasion of Tibet by the Chinese, in leading the exile of Tibetans, in rebuilding the Tibetans monasteries in India, in bringing Tibetan Buddhism to its popularity in the West and rest of the world, these are incomparable and more than any Tibetan or single monk has done.
The incarnations of high lama have always been about what work they can carry out to benefit sentient beings. If returning to lead Tibet is no longer deem beneficial then it should be no surprise that the incarnation line will stop. One of the most basic teachings of Buddhism is impermanence, as such incarnation lineage is no exception. I believe no matter who and where the Dalai Lama chooses to incarnate in his next life, it will be to benefit countless sentient beings just as all his past lives have done.