"I'm starting to think that bitcoin as a store-of-value might end up being more attractive than bitcoin as a medium-of-exchange." -Gavin Andresen, 10-17-2010
Yes, that seems to be happening now. However, if MOE function falls too much it will quell SOV advancement (i.e., slow the price rise), which will allow MOE function to grow again, which will eventually spur SOV growth, which will interfere with MOE (but less now, since market cap is bigger), etc. So they may take turns leapfrogging each other.
The great thing about bitcoin is that it can turn from being a store of value to being a medium of change on a dime (pardon the pun). Want to save for a rainy day? Do so. Need to spend it? Do so. In many ways, it's a new paradigm.
Yes, "store of value", "medium of exchange" and "payment processor" are just facets of Bitcoin. We're used to thinking in those terms because that's how money has been and how it has moved until now. But, in spite of the naysayers, Bitcoin truly is a different concept, which gathers all of the above (and perhaps some others that we haven't even thought about yet) into one simple and elegant solution.
Gavin's a wonderful developer, but this falls into realms that maybe aren't his strongest suit.