I fish from a kayak almost exclusively but I've been wanting a boat for a while now because of some of the advantages of a boat. Mainly space and the ability to go from one point to another quicker (a lot quicker). Also there are times I would like to fish with someome else and be on the same boat.

i'm happy with my 12' aluminum with my 9.9 though i would like to have a deck on it instead of standing on a seat

For me it's "horses for courses".

 

Boat for bigger water.  Can't fish Lake of the Woods, or even a local, 6 mile long lake effectively from a kayak.  Even a 200 acre lake would have a lot of down time from something I had to paddle.

 

Canoe (Don't have a kayak) for small lakes and rivers.

 

Wade for the really little stuff.

I like that you can actually see what is happening in the water from a bass boat and that you can cover water quicker from a boat. However, I really really really like fishing from my kayak; I can catch some big fish in water that is only 2-6 inches deep and are back hiding in the button bush and sumac bushes. I can also fish some of the very shallow rivers in my area that are home to some very nice smallmouth and pike that you could never get to in a bass boat. 

I do not currently have a bass specific powerboat but I have had small bass boats in the past. I love my kayaks but I am not sure you can cover all bases with either as each has their pros and cons. There are so many places that I cannot go with a larger powerboat and in many places it is simply illegal. I have also owned several canoes and cannot think of a worser vehicle for fishing, YRMV.