"as we see it is coming to a point where a lot of new innovation is needed"
When you can measure gate widths in the number of atoms across that gate as no more than a 3 digit number the end is approaching.
If you're talking about density of data your options are pretty limited.
Shrink the gate width.
Well that's already happening.
Shrink the thickness of the chip (and lay several of them on top of each other)
Starting to happen but that IMHO can go much further. But if you think the heat output of current processors is fierce that's just getting started.
"Quantum" computing (how many definitions of this are there?). If 1 atom can have many quantum states then it's carrying out the functions of hardware made up of many more atoms. Can the number of Q states the atom can take up (and therefor "replace" other atoms in a more normal structure by doing so) make up for the huge number of atoms needed in all the peripheral gubbins needed to read and write it? Can you come up with I/O devices made up of just a few atoms themselves?
And of course there's my personal favorite in the tinfoil hat SEL stakes "engineering" the energy level transitions of individual atoms.
No I don't know what that means, but it sounds cool as f**k.