It's awesome that I can now check Twitter or browse Instagram when I'm on-the-go, but that doesn't mean I want to use mobile apps when I don't have to.
I left my computer at the office last night, and I HATED only having my iPhone at home this morning. Doing anything took more time, I had to hold it up, and I couldn't do anything meaningful or productive.
*Yes, new TYPES of products will be invented because we now carry a powerful computer, equipped with sensors, in our pocket. But I don't think that means traditionally web-first products will (or should) be primarily mobile. If it requires critical thinking, I don't want to do it on my iPhone.
This is probably a naive perspective so it would be great if you could poke holes in it!