This is already being done with simple design software that uses lots of prefab pieces for people to click and drag to make their designs.

AI software may exacerbate this trend, but at the same time everything starts to look the same when using those tools. I suspect the same will be true to some level for AI design and art.

Unique design work will still probably be best served by a quality designer. Whether they use those tools or not will be their choice. But implementation and art direction are something AI will take a long while to catch up with. Just like self driving cars can do some things really well but fail at other aspects.

I'm a graphic designer and have been professionally for the last 16 years. Just the capabilities in non-ai based design software have made leaps and bounds of progression from when I started. The benefit in those improvements have cut my working time for specific tasks. I think future AI will mostly cut work times more and allow people with fewer resources greater access to more professional looking design.

But tools don't make good design, I've seen lots of garbage from people with access to the same tools as myself.