That is not accurate. You can have FiOS TV and Internet while still keeping your copper phone line. The FiOS TV and Internet have to be on a separate account and paid monthly via a credit card. It really isn't a hasle to order it and keep the copper line.
When you call for support you have to tell the automated phone that you do not have a phone number in order to be transfered to the correct department.
I had my phone line switched over to fiber when I got FIOS installed and it works fine. It is not VOIP it is the same POTS line but the signal is carried back to the central office over fiber instead of copper, functionality of FAX, alarms, phones, modems functions exactly like a POTS line (I tested it on my phones).
The system has a battery backup, in case the power goes out that powers the phone system for up to 8 hours of talk time. I tested this the other day I unplugged the ONT power unit picked up the receiver and the dial tone was there, made a call and it was fine, actually the line sounds louder and clearer than the old copper line.
I went to bed, got up 8 hours later and the dial tone was still there and again made a call no problem. I went to work came back and I still had dial tone! So its 8 hours of usage not total time. If you are really worried about your power grid you can get a backup battery and charger in case you power is out for weeks and you need to make a lot of phone calls. If that is the case though you probably will have more to worry about than if the phone works.
The benefit to Verizon for this is they are going to save a lot of money not needing to have to supply power to the phone system for the POTS phone network. The draw back will be the customer will now be responsible for powering his own network. This may be a deal breaker for some, me I don't care.