Currently, public sub counts are abbreviated in most but not all places across YouTube. In August, we’ll make this more consistent by always showing abbreviated sub counts publicly. Creators: You’ll still see your full sub count in Studio! Learn more → http://yt.be/help/abbrev-count …pic.twitter.com/pmaKk4EU4k
Please don't do this. There's no good reason for it. No one cares about the "consistency" of it looking the same everywhere. People want a functioning site where they can share with their community, and you're just making things worse. Fix the Real problems first.