There is no instument as diverse, as a keyboard... but that comes at a cost... it takes much much more time to master it then other popular instruments... if you excersise 2 hours a day, you will be able to play Bass in a band after about half a year, guitar will take about 2 years on average... keyboards will most people take atleast 10 years to get on an average level... and about a lifetime to master all aspects of modern keybaords (piano, organ, synth, arranger) are all quite different disciplines..
Since i am trying to get to a descent level in all of them.. i am quite sure i will never be a master of any of them.....
Maybe if i had to do it all again, i would start out with Bass, and get really good at it, so i would have the confidence to play on stage...
But then, i have a daytime job that i really like, so i dont think i would exchnage it for a career in music... altough i might still like gigging ocasionally in the weekends...