This ignores several key factors:
1. People have been asking for a reset for a long time. I've always hated the idea, but I can understand their perspective. They feel bored with a world that has not been reset in so long, and want a new challenge.
2. A new shop and Wild has been mentioned as underway by @KlutchDecals
3. Gamma is planned to be more than just another Towny world. This is already shown in the lack of spawners. If things go as I envision it, A/B will stay as the same form of Towny we're used to, while G becomes its own thing, which explains the separate economy.
4. If we're truly honest, things were not doing well before the update. I'm not trying to spam "Meep is dying!" , as that is not necessarily the case. The fact remains many people were leaving, and we must acknowledge that, and improve on it. You cannot fix a problem until you recognize it as one. We need to recognize standard Towny gets very boring to some people, which is why we need grinds to keep them going.
Overall, it's a balance. We need to recognize the problem, but also remain positive. Things cannot get better if we tell ourselves everything is fine, but things will also fail if we think there's nothing we can do to change it
5. In my opinion, this is the best possible option that answers both sides of the reset issue. Towns A/B need a portal in spawn, because we want them to continue alongside Gamma. Gamma will remain popular for a long time, because it already plays different then A/B in the fact there are no spawners and never have been any perks.
Right now, with the stuff already added, it certainly feels like Alpha/Beta will die out rather than be deleted, which is the opposite of what Gamma was supposed to do. I have to admit, I got a terrible feeling when I read the Relaunch notes (same feeling I got when I read the EULA compliance thread, honestly), but I decided to give it a chance. Upon logging in, and playing it for the day, all my fears were answered, as staff have already promised to add things to keep A/B going full steam.