Bitcoin is usable as soon as it was created. What you speak of is lack of merchants accepting bitcoin and this will not increase unless something more lenient approach is done by governments. The fact that bigger companies dont like crypto is evident here. So it is better not dwell on that thought and use bitcoin as much as you can without hoping for more "uses" than speculation.

Prices did not change much last 2months. It has been between 10k to 9k USD and is pretty stable if you consider buying something worth a 100$ price tag. The "too volatile" is a phrase used by nocoiners to take people away from crypto. A 5-10% swing in price will not have significant changes in your expenses provided you are not spending in the order of millions.