Considering that I play on my Switch 80% of the time, yes I could easily be satisfied if all I had was a Switch. I buy all multiplats on Switch because the portability yields me an extra 4 hours a day to play them. While there are games on my PS4 Pro that do not come out on Switch, there are plenty of games that interest me that are on Switch. In fact, I find it hard to make time for PS4 games with my Switch backlog as it is, and the rest of the year has already been claimed by 8 Switch exclusives I have already pre ordered (thats not even counting multiplats). There are still games on PS4 that I will make time for such as God of War, Horizon, Persona 5, REmake 2, and DMCV but as time goes on I find myself less motivated to.
What people need to realize is that not only is Switch a viable primary/only console, but many already treat it as such. All gamers have different needs, and there are just as many that prefer the portability of the system with the benefits of being a hybrid as there are those who only game on a TV. Those that deny that fact either want Nintendo to fail anyway and are bitter about their success, or they are only looking at their own personal preferences and wrongfully jump to the conclusion that most people must feel the same way.