Next year? No chance in hell.
I could see it happening sometime in the near future (like 5 years maybe) if other teams keep switching to the 3-4 and figuring out how to beat it.
I don't think we'll attempt any type of switch until Hampton, Kesiel, Smith, and Harrison are all gone though. Maybe then we could make Hood a DT and Woodley a DE or something. But it would require some major personnel changes and right now in the immediate future would just be too complicated for whatever benefits it would pay off. Not to mention the staples we would have then (Hood, Woodley, maybe Worilds and somebody we draft this year) might not be anywhere NEAR as effective in a 4-3 scheme at the NFL level.
I actually like the 3-4 better anyway though