I'm not trying to scare anyone. If you don't want to think about how things will work going forward, then don't. But you don't get to say what I can/can't think about and you don't get to say what I can/can't post about. All I said is "it will be interesting to see what the requirements are".
Yes, it's possible you (general) get one shot (or two), and that's it, you're done for the rest of your life. It's also possible a yearly booster will be needed. It's also possible that boosters will be needed multiple times a year. Because the testing was cut short on these vaccines, we don't know how long they will help. They could run out in three months, six, nine, 12, 15, or last decades. We don't know.
I know people on here want sunshine and roses, but the more shots that are required by a single person to keep this virus at bay, the less likely the general population is keep up with it.