I'm not sure its reasonable. No one in Israel is thinking that way at least, and for good reason imo. The motivation to kill is there, so you have to assume there's a lack of ability. OK maybe for a couple of years Hamas will have to regroup, but how much time does it take to get a couple thousands more guns and grenades and bombs when Iran is giving them for free? It doesn't have to be another attack of this magnitude, even killing "only" 100 Israelis would be a huge blow.
You prevent this type of shit from happening again by being dead serious about countering terror, about deploying sufficient defense and not assuming too much about what the enemy can do because you might not have an accurate picture. Israel has been doing none of that in Gaza in the last decade or more.
I see what you mean now, I was under the impression you think Hamas lost all motivation or means to even try it in the future. Yes if Israel does all the right things the chances of this happening again soon are low.