You're suggesting that Google is going to charge for gmail and/or G+? That seems highly unlikely to me. Also for "Apps for Your Domain" they already do charge if you want more than one account.
My Google Apps account has 10 free accounts, because that's what they gave you for free initially.
People also don't remember that Google Storage was like 10 times cheaper prior to Drive, which is why I was initially backing up my photos in Picassa. Well, not anymore.
