The majority of people who think that way don't have the patience to even play a game if they have to wait more than 10 seconds until action hits 
It also has to do with the game itself. There are a lot of generic turn-based games out there who made it really boring x~x I own a few PSP RPGs which have a "average" turn based system but the way the game and system is presented is so boring I can't play through it.
Some games are better at showing turn based than others, I love how Final Fantasy X and 7 did turn based, the entire Dragon Quest series does it well, Shin Megami Tensei does a great job at turn based as does its various spin offs like Persona, and then the big one being Pokemon. It's not outdated, anyone saying that is full of shit. A core mechanic like that cannot be outdated, the way it is handled and presented can be -but not the mechanic. That's like saying chess is unplayable nowadays since you have to take turns
