If you are sticking to a reasonable AA, I think you should be fine. Anyone who is maintaining an AA will have sold a fair amount of bonds over the last year. If bonds plummet, you will have sold high and will get a chance to buy lower.
I would not choose this time to up your allocation of bonds though. I think they are pretty dangerous at these levels. They appear to be irrationally priced to me. If you have an extremely high allocation to bonds out of risk adversion, I might consider the possibillity that bonds could end up being just as risky as stocks going forward from here.
Disclosure- I continue to maintain my essentially 100% stocks asset allocation.