More and more Keyboardists I know aren't buying traditional keyboards anymore. They're using stuff like MainStage and just a cheap(er) midi controller and their laptop.
We've actually been doing this for a while at my church, but there are a couple of things that I find difficult about the set up. Namely, a decent audio device. Struggling with using the headphone line out. It seems like there's always some sort of buzz coming through the cable. (blasted semi-powered lines) and setting up another usb device (with two or three keyboards and a computer that I already have to hook up) just seems largely unappealing.
What would be great is a USB midi controller keyboard that has a sound card built into it. Bonus points would be to have XLR outputs (L+R) and two 1/4" outputs that could be separate from the XLR or mirrored. (I'm also sick of dealing with DI boxes) or the L 1/4 could combine a mono output of the XLR Stereo. (toggle buttons) Just a really high quality output (96k). 1/4" is for running a monitor that doesn't effect what you're sending the house. We don't even need a mic input (though you could put one on the back and sell a goose neck for Vocoder action, but even that wouldn't need to be a high quality input, just something cheap for a vocoder). I haven't seen ANYONE make ANYTHING like this yet (if you do know of someone, let me know because I'm interested) and something like this totally fits Behringer's niche.