Right on, Al!
However, there is a small consideration to the arguments (up thread) that there is too much possible revenue to be lost with future price increases. These Forever Priority Flat Rate envelopes come with your return address printed in them.

If your address is preprinted, there is much less chance for postage arbitrage, thereby weaking the loss of revenue argument. However, with a small effort, you could paste a new return address over the one preprinted when you bought the envelopes. They must be banking on the fact that this over-pasting is too much work for the typical buyer of discount postage.
Interesting. Surely, the USPS bean counters have analyzed this to death.