If millennial's look for a company culture to allow them to become their best selves and emphasis personal growth above all. They may have little commitment to a long term relationship with a company.
If this is true it make me think that AT&T also knows this and is working to capitalize on this mentality. AT&T would ask for high skills, continued certifications connected to work capabilities.
AT&T may continue to roll off employees claiming their skills are not in line with the company needs. In reality they know that millennial's have less of a connection to the company and will "like sheep" accept this treatment. In turn AT&T gets rid of those who are getting that 3rd or 4th week of VAC. Also those getting close to the MR75 bump in Pension. Additionally AT&T gets to hire on new, young, recently certified employees at a lesser total cost.
Overall it makes me think that AT&T and other large companies are not blind to the evolution of our work force. They will look for ways to use the young employees work perspective to further their own bottom line. (ALL ABOUT MONEY!!)