Switching between 4 potential input methods will definitely slow down your learning. Unfortunately, you'll probably find you like at least 2 or 3 depending on what you're typing (or typing into).
Once Swype (or a substitute) hits BB, even the physical keyboard will likely find few new converts. It's simultaneously fast and forgiving. Even as a touch typist and former BB keyboard lover (8820 forever!), I'm faster on Swype after just a couple of days. It still has one major drawback inherent to all virtual keyboards - it covers part of the screen, possibly leaving you with less visible screen (non-keyboard area) than a traditional BB 2.4" screen. Luckily I'm rocking the Swype on a 5" screen, so there's plenty of real estate to go around!