Trading Votto is unnecessary until 2011 at the earliest because, really, Alonso and Juan and Frazier all could theoretically use one more full year in AAA.
At that point, with Votto on the block, you can assume Alonso's had a monster year, likewise with Juan, including all you could ask for in September.
I see Frazier a Red for a long time and more likely tied to the fate of Rolen's health and BP's contract. Either way he'll be available to garner some serious playing time as a top rate super sub. I am concerned about his mechanics though.
I hope all three bake in AAA most of the year unless Balentien really sucks badly in LF.
In the end, I think Walt really knows the right way to go when it comes down to it, and we won't know his super secret plans until they happen.