If the N64 had CDs, the competition wouldn't have been close. What hurt the console the most was the shitty ports due to limitations of the format, high price (Some N64 games cost me EIGHTY DOLLARS), third party support (again due to some games having being impossible to port.
You look at the N64 version of games vs. the PS1 versions--the graphics were often better and felt more solid while the PS1 versions were flickering messes but when you put them side by side, the PS1 version would have CGI cutscenes (a huge deal at the time), more voices, more music tracks or announcers, lower price, and sometimes more content. It made the N64 versions seem like they were incomplete. Meanwhile the PS1 version would cost $39 and the N64 version was costing $49-$79
The only downside to having CDs on the N64 would be increased loading time (which some carts STILL had) and the fact that ice cream would start tasting like chicken and cats would bark. Don't ask me how. It just would.
