With possibly better I meant that you should explain why we should focus on sidechains, but not for something like Lightning Network (a single example). In order to establish a strong thread you should have listed out potential solutions and argued why sidechains are better. That's why I was aiming at.
1,2,4,5,8,9 : Yes.
3. I don't completely agree with you. This chart is based on the USD price at that time (right?), and thus it would not clearly show if there is an increase of volume or not. The amount of Bitcoin transacted daily would show it a bit better. The amount of transactions per day shows an even better picture.
6. What are the benefits of fiat exactly? The benefits of Bitcoin might not justify it for the average person, but I'm not an average person and thus disagree (for myself, not in general).
7. Somewhat.
10. If we aren't careful, yes.
11. Possibly.
12. They could, yes.
13. I don't want an array of currencies.

---

---

However, this still doesn't present sidechains (which are still experimental) as a solution. You haven't even explained what a sidechain is (for those that do not know). I'm asking for more of a technical analysis (if you can provide one).