This is the end, isn't it? I don't want it to end! Technically speaking, there will be 2 more episodes, but still, this is the real end. The end of one period of their life. A major milestone. I'd like to say here: "This is not the end yet. It only begins now." As much as this may be true for the four of them, one thing is sure: Keion is over. Even if they keep playing as HTT, they are not the Light Music Club anymore as the club is not just them, but also the clubroom, the school, the advisor Sawa-chan-sensei, and all of their schoolmates who have been supporting them all along. Now, they had to say goodbye to these surroundings and move forward, towards the unknown tomorrow.
Even though I said I don't want K-ON to end, honestly, I think it's much better if it ends in a grand way while it's on the top, rather than if it goes on and on until the series has been completely exploited by episode 150. It would be a shame if such a great anime had a lame ending.