Yeah, it's easy to resample a 24 bit recording down to 16 bit. There's a program called r8Brain that will do it.
http://www.voxengo.com/product/r8brain/
Is it worth recording in 24 bit? Well if you're just going to be listening to it in 16 bit and you're not planning on keeping the 24 bit version, then it's a bit pointless. Depending on the quality of your mics you may not even be able to hear the difference.
Try it out youself and see what you think/
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