You can't make decisions today about what will be the standard in 10 years. Computers will be exponentially faster and used for different things. It's just pointless.
JSON is widely accepted now, and BSON overcomes its only real shortcoming (lack of binary support).
There's nearly 0% chance any of your software (or any of ours) will still be used/maintained in 10 years, so make a decision about what's available now.