The issue is there are physical limits to what they can manufacture and anything beyond those limits has to be nano-tech based.
One of the other major issues is that we just do not have the software architectures or platforms to support extreme compute capabilities where hardware has moved at a much faster rate. Single threaded 32bit applications were the norm for a long time and in some cases still are, we have seen a slight improvement over past few years with more multi-threaded multi-core applications appearing but software companies have to be careful of not trading less software optimization due to more hardware power.
At the end of the day we kinda still want operating systems to be less intrusive and small in terms of resources they use, we want software applications to utilize cpu, memory and gpu hardware correctly and load balance properly in 64bit environments.
While hardware might reach a peak and hardware companies are well aware of what that maybe they also know that software is still a decade behind in terms of being able to utilize existing hardware to full potential. This is of course for desktop computing.
Server computing is a different beast and perhaps where we have seen the best hardware/software utilization overall so at an infrastructure level we are getting it right but at a desktop computing level the trends are slowly deteriorating the desktop market in favor of mobile devices.
From the perspective of future hardware we really need engineers and software companies thinking how do we best use this hardware. I think we will see more artificial intelligence developed by the fractional few engineers that study robotics, and if self learning is developed also in devices then we may see the semi-autonomous home within the next decade where appliances can do most things by themselves.
Gadget autonomy and AI is the first step but the hardware ability right now enables further progression in the scientific context. AI comes with ethical issues and I think the terminator complex resides strongly among those in the research field whereby compute bio technology or high level AI robotics could very well lead to robots being more capable in nearly everything that humans currently do.
We have already seen this in manufacturing since the 80s and whilst technology gets more advanced human civilization is deteriorating in terms of its intellectual evolution. We have been corrupted at an educational level from the outset of elementary school and our brains are actually much more capable than the overall use they actually get.
The idea of enhancing ones abilities through technological implants is now a lively topic but sadly this is only compensation for the lack of training we are exposed too at an early age whereby we could utilize higher level abilities as human beings.
A better investment of technology rather than modifying ourselves with gadgets is probably to use the tech to further examine how to better our genetic composition.