Had Tim Cook been a smarter man, Apple would already be the dominant player in the enterprise scale hardware market, just by virtue of the fact that it makes the best chips, by far.
Apple needs to return to the datacenter market. It doesn't need to pull any resources away from its own OS development to do this, because Linux runs the majority of global servers, now.
It just needs to make the hardware available in the right form factors. It has the money to do so.