I'd rather they were both competing on the same market. It's like a good love hate relationship. Monopolys suck as when there's no competition prices go up so if one gets the upper hand, then crashes the other to be alone in a market they wouldn't have to compete in price/quality fashion but the consumer would get hurt.
It can be hard to tell what happens in near future. Who'd have known amd would have merged with ati back in the day? Or microsoft get involded with Razer?
Heard some rumour about high-end gpus being integrated into cpus to make the separate graphics cards obsolete but i doubt that.. 3D screens didn't expand with a boom either..
In hard times companies can change, emerge or disappear but in the end the consumer shows the way to what gets popular. At least i hope so.