Believe what you will. I have a MBP with gestures and I find some useful and some annoying. I can do fine artwork with a mouse and Photoshop (stylus is even more useful), but I can't do it with a piddly trackpad. I would not want to play 3D shooter games with a trackpad either. In other words, trackpads have their uses and are getting better for some tasks with gestures, but they're not the answer to life, the universe and everything either. Every task has its ideal tool. You don't throw out hand tools because air tools are available. They're unsuited for many tasks (particularly delicate ones).
You gave more details, but that's precisely my point. There will always be some uses for a mouse just as there are some uses for a chain saw. But just as most people won't need a chain saw in their daily lives, there is coming a point when most people won't have a need for a mouse in their daily lives. You want to use one for Photoshop? Keep using it. But most people do not use Photoshop, and that's my point.
We have been forced to use a mouse for *everything*, even when it was the worst option. Now we have direct hand gestures for when it makes sense. And we will have a mouse for when it makes sense for a mouse. My point is that most people will use gestures, while only certain specialized users will employ the mouse. Web surfing, email, media use, reading, many games, all of these things work *better* with gestures. That covers the majority of user's needs right there, and that's my point.
By 2020, mouse usage will be the minority.