No, we cannot!
As detailed in the discussions to a similar question, waiting with asking your question just out of a fear of spoilers is exactly the kind of anti-information philosophy that goes against everything SE stands for.
Also, how much time is enough? Who says that a week is the right amount of time to wait? What happens when someone does ask a question? Do we delete it? Do we close it? Do we tell the user to come back next week? The question is for all intents and purposes on-topic and appropriate for this site, so it gets asked! Artificial time limitations would just seem ridiculous and not help the site at all. Instead people go elsewhere with their questions and answers. They'll do the hell and sit around on it for days.
There are better ways to protect people from spoilers while not shutting off any kind of dicussion at the same time and these things are already done, primarily not putting spoilers in question titles.
On the botton line, what you propose is exactly the opposite of dealing with nowadays' internet spoiler paranoia in a reasonable and sane way, because it's basically giving in to the madness and shutting off useful and informative discussions on a topic people are clearly interested in on the sole basis that a select few people just don't have the impulse control not to click on a question about a film they don't want to read anything about.
And even more so, you have absolutely no right and no reason to be angry at someone asking a question about something he wants to know from a film he just saw. It is not their fault and if you had seen the film, I have strong doubts you'd hold back with your questions much, seeing how you yourself tried to ask myriads of Endgame questions weeks if not months before the film was even released. This anger is entirely counter-productive and misdirected and I'd urge you to overcome it rather than blaming everyone else who has seen the movie except for you.