Yes, the past 30 years have been an amazing whirlwind of development of consumer computing technology. Yes, things won't be jumping by leaps and bounds the way they were when the basic hardware and bandwidth were getting up to speed. The latest social app is not going to blow you away the same way, say, the invention of the Internet did when you first discovered it. But I'm sure it pales in comparison to the wow-factor of the telegraph when it was first invented.
We live in a time when computing technology has filtered out to the mass populace. It is an interesting time to be sure. But we are just scratching the surface of what is possible with computers. There is tons of work to be done to refine the art of computation, which I believe ends with creating AI that can do things we are incapable of doing as humans. That is still a very long way off.
And assuming all goes smoothly without any major natural disasters or self-destruction, after that, there will be a new chapter in human existence where I believe we will have to come to grips with having automated everything and no longer having to employee people en masse. Where will we find meaning once the struggle to survive is pushed so far from our daily concerns?
The point is things are constantly evolving, and there is no chance that things are about to get boring. "Web", "Social", and "Mobile" are only "done" if you are tech pundit looking to summarize the state of the world in a tidy 800 words. The reality is that these things are just building blocks whose novelty has worn off, but whose ultimate utility is far from being realized.