Ultima begs to differ. Reading for days, and an actual challenge in terms of puzzles and what not. You would think ADHD need not apply, yet ADHD loved it because it was usually one of the few things they could focus on.
And no, most gaming back then was not on consoles. In the 80's, which is the start of the computer RPG, most gaming was on Commodore 64, Apple II, and PC, and other home computers. They were actually more households with those kinds of computers by far than with consoles, and every one of them was a gaming capable system back in the day.
This actually depends where you live. In Europe, the NES/Famicom wasn't nearly as popular as personal computers, but in the USA, the NES surpassed the computer in the late 1980s. You have to take into consideration also that the NES didn't even come out in the USA until late 1985, and only in New York City at Toys R Us. It wasn't for about another year that it was finally released elsewhere in the country. Of course computers would be more popular than the dead console market (from the 1983 crash), because there was no serious competition for half the decade. But it wasn't until 2000 when half of households in the USA even had a computer. When the SNES came out in 1991, only about 20% of households had a computer.
https://www.census.gov/prod/2013pubs/p20-569.pdf