Well, considering to compete in a tournament you MUST paint the figures, that already excludes people like me who have NO artistic skill, Or even just fine painting skills.
Look, you only need three paint colors, and primer counts. So you base coat them in either white or black, paint helmets and shoulders in another color, and paint weapons either in gray (or gunmetal, fancy!) for models with black primer, or in black for models with any other color of primer. Now you're done. You don't even have to paint your bases green.
This is not really an arduous requirement. The level of fine motor skill necessary for this level of painting is pretty low, it takes a fair amount just to position your models on any kind of decent playing field, take your measurements and so on. If you can handle that, you should be able to handle the paintwork.
I can understand side tournaments where people compete based on their artistic skill that's unrelated to the main event, but tying the two together means someone like me who can't paint worth a damn won't even bother trying to enter.
Well, that's a valid reason why they're going away. Another is that video gaming now makes the more rules-and-dice tabletop gaming obsolete. The computer now manages all that annoying fiddly stuff. It's really put the boot into warhammer, battletech, and all the other miniatures-heavy games with rulers and protractors and shit-tons of dice, even if they are all D6.