It depends on if you are a heavy mouse user or a heavy keyboard user and you are using a laptop with a restricted keyboard. Personally to scroll a document I prefer the buttons page up/down home/end. Often I also use those buttons to select big parts of a file that I want to copy. E. g. Shift+Ctrl+End form me is a useful combination. On the other hand I rarely use the numeric pad for numbers, but I also feel more comfortable typing with the left hand, I guess that a lot more people heavy keyboard user would prefer the numeric pad.
Yes the mouse is changing the habits for a lot of people, but the numlock may still be useful for some.
Did you notice how the quality of the results returned by google degraded over the years? When it started they had to take out of the market the competition and they strived to return the best possible results. When they became an oligopoly with their alter ego bing they begun to restrict the navigation to the sites in their friendly network.
The other big sites played the same game sharing links mostly with the other big known sites, the media took part in the game by attracting the attention on those big known sites. A combination of restricted horizon, but with overload of information to reduce the users need to look outside that horizon. This is the result you see today.