How will the Himalayas mountain range be in the future?

Answer 1

Due to the continuing (very slow) collision of India with Asia, some mountains of the Himalayas will be pushed even higher than they are now, until erosion begins to tear them down faster than they are raised. This will take many millions of years.

The Appalachian mountains of North America were actually formed by a similar collision that formed the supercontinent of Pangaea, but eroded away over a period of 300 million years until again being uplifted during the Cenozoic Era.