They could do whatever they want... they could invest in a number of different technologies. But posting on this forum, which is a technical support forum for users with questions about how to use Apple devices that currently exist, won't do much good, as nobody here is in a postion to make any decisions for Apple or recommendations to them. If you have a direct connection to the senior executives or board members at Apple, you might want to suggest it to them, as they are the only ones who would have the ability to make such a major decision. Otherwise posting on this forum will do nothing to get Apple moving in the direction you want. And to be honest, ti is against the terms and conditions of this forum (which include not allowing speculation on future Apple products).
If you just want a general discussion on the direction you think Apple should take in the future, I suggest you visit the forums at macrumors.com or 9to5mac.com... but again, posting these questions there will not make any impact on Apple's future directions.