Then go up to 99Wh, and stop with the "thin" thing. I have the 2014 MBP and it's plenty thin. No need at all to get thinner than that.
I personally think their whole obsession by making these laptops thin is contra productive if you think off al the things (non solderable RAM for example) we need to give up for it in return.
Or maybe they should just give the user a choice.