If I root my Droid now, will I have to root it again to get Android 2.2 (Froyo)?

Right now I have Android 2.1. I understand that I can go back to 2.0.1 (losing all my apps and settings in the process), then root it, and install a ROM that's based on 2.1.

But 2.2 (aka "Froyo) is almost here, so will I have to do this again to get it? Or is rooting something that is only done once, and so when 2.2 is out I can simply install a ROM based on it without rooting again?

Thanks!

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