By that time many of the today’s desktops and laptops will have enough modern hardware to support the current unity3D graphics capabilities. Recently canonical showed the new changes in the unity3d desktop’s graphical features.
The features that were demonstrated by the gnome and unity are definitely the next step towards modern desktop. It only leaves you with one question, whether your computer supports unity3D or not.
Type the following command in terminal and see the results.
/usr/lib/nux/unity_support_test -p
This command will print the unity support test result on your terminal. If any of the test result says no then you have to upgrade your hardware.
As of version 12.04 of Ubuntu, you get OpenGL version 3.0 which may not be supported by old pentium 4 hardware or earlier computers. In such case, you have to upgrade the hardware in future because unity 2D will not be supported in 3 years from now.
These are again my views towards upcoming changes with unity desktop. If you want to get the current updates regarding the desktop then surely you should check the ubuntu weekly newsletter and planet updates.