I do have an issue with events, but it's not exactly the same issue. I don't like how many there are and how many of them are more or less the same. If there were fewer of them and with more variety I think that would be nice, but that's not really something within anyone's control unless LL bans events, but I doubt that'll ever happen, nor do I think it's necessary.
I highly doubt SL will ever collapse without an alternative and as of yet all attempts to create alternatives have failed beyond maybe IMVU. But even IMVU is incomparable to SL and would leave many of SL users unsatisfied if they were to try it, many even came to SL from IMVU due to how IMVU is. I feel the only way SL were to collapse is if it either becomes far too expensive for everyone, which is incredibly unlikely, or of LL shut down SL themselves, which I doubt will happen in the forseeable future without them creating an alternative. Which they have tried and failed at least twice now. And if any alternative happens the good and bad will just transfer over to there along with the users. I really don't believe enough people will leave SL for it to be discontinued without an alternative virtual platform.
I don't understand "a large segment of the buying community are those that create here." In all likelihood it's at most below 50%. There aren't going to be enough creators or customers leaving SL due to the gacha ban for it to destroy SL on the whole. Enough creators will make enough of a profit. That wont change due to pretty much everything in the above paragraph. People like SL enough, both as creators, customers, and otherwise, that the only thing the gacha ban will due is ruin a few wallets who wont adapt to regular sales and cause them to seek money outside of SL. Which I'd rather that than have them continue to take advantage of people's addictions/desires/etc.