I spent about 4 weeks working on the transition to Dvorak, and it never 'clicked' for me, and at the end I was in the 40s for my WPM touch-typing Dvorak whereas I'm about 85 on QWERTY. After 2 weeks in Colemak, I'm at 40 WPM and growing.
If "learning curve" is stopping you from switching keyboard layouts (as it was me), don't let it: Colemak decreases that transition time to bearable levels.
I switched to Dvorak some years ago. Because the keys on the keyboard did not match what you got when you pressed them - Dvorak forced me to touch type - which I hadn't been able to do on querty (or rather quertz) for lack of pressure.
Now I am much better at querty and Dvorak. You do not unlearn the old layout. In fact I find that I can alternate between both layouts as fast as I can tell the computer to switch. (I assigned the windows-key for switching.)
If "learning curve" is stopping you from switching keyboard layouts (as it was me), don't let it: Colemak decreases that transition time to bearable levels.