I am not so confident : they now require that you ship a 64 bits version of your apps, which can be also be a problem if you use 32 bits only proprietary libraries.
There's a good reason for that requirement. Loading 32bit apps on a 64but device requires loading all the 32bit version of shared libs, massively increasing the memory footprint.
And since you'll certainly not be the only one with that problem, Apple making it mandatory for iOS would probably spur development in that area.