I dont think it is a must to use Lite_C in a7 you can still use c-script
Obviously you can likely expect to have to adjust your original c-script for A6 simply because you will be using an other engine
The point in my opinion is an other
Lite_C will be released first and A7 will follow
Is it possible to use Lite_C in A6 and later on to port your game in A7 with minor Lite_C code modification ?