First, I will probably invest in a few rolls of the "forever" stamps whenever they come out. I won't buy a big supply, however, since I already have most of my banking/payment transactions automated in whatever way the company or financial institution provides. I currently only pay my mortgage, car insurance, and cable service bills by snail mail -- and I will put them on automatic payment whenever I get the opportunity to do so. Another thing I use snail mail for is my annual Christmas card mailing, which can vary year-by-year from 20 - 30 pieces of First Class mail, depending on whether or not I manage to actually scrounge up some Christmas Spirit in time to send them. Also, as an amateur radio operator, there is a regular need to mail out QSL cards -- postcard-sized reports of an on-the-air exchange between two amateur radio operators. I haven't been at all active in the past couple of years, but my interest in that hobby runs in cycles, and when I am "on-the-air," I can send out several hundred QSL cards a year. So, the "forever" stamp would potentially be a good deal for that use alone. Perhaps I'll put away a dozen rolls before the rates increase. If anything, I can always sell them for what I paid if I don't use them.
BTW -- in the U.S. a unit of First Class postage is a major bargain. Most EU countries pay about a buck a pop for the equivalent of our 39-cent 1st class postage.
The "centralized mailbox" scheme is pretty much the wave of the future, particularly in new developments. It saves the postal service a lot of time -- mail for numerous residences can be delivered in one stop of the truck. Even though I live in a fairly low-density development, we still have the central mailboxes, one per street, with around 12 homes per street. All the homes in my development are duplexes, and each "street" is really a Cul-de-Sac. Therefore, it's not a long walk to the central mailbox.
I wonder how long it will be before people who live on "traditional" residential streets, with individual mailboxes, will be able to get such door-to-door mail delivery? I would not be surprised to see such neighborhoods converted to centralized mailboxes in the near future.