Why are some people so focused on one ending choice they made, instead of being excited about all the story possibilities that got created? Maybe we get different games set after different endings, maybe we get one game where many endings can be acknowledged in different states of the galaxy that are not central to the main plot of that game, maybe some ending variations will never be acknowledged.
But so what? Isn't the most important thing that we get a great new story in an exciting setting that acknowledges the history of ME? Maybe that setting fits perfectly as continuation of one or all of your playthroughs, maybe it doesn't fit with a particular one and is in a different timeline. Couldn't it still be interesting to ask "what happens in the ME universe if my Shep had made decision A instead of B"? I mean isn't that question the reason why many players have multiple playthroughs to create multiple timelines in the trilogy in the first place?
I could write a wall of text about how control should basically be the same for the survivors as destroy, so IMO those two fit perfectly into the setting for one new game (in short: because the threat of someone taking control away from catalyst-Shep with the goal to dominate the galaxy is too big, it is probably not the best idea to influence the galaxy in the open with Reapers flying around - if it is even a good idea to influence the galaxy going forward at all). But even if the writers have totally different futures for both ending situations in mind and want to make for example one game after each of those endings, I am saying again that I would be interested to play through both possibilities. And I am saying this even though my Shepards always take the destroy choice - after an accidentally control choice in my very first playthrough that is. Who was I to think that I would make my final choice using the dialogue wheel? 
So I ask, why not simply accept, that in the next game there will be a new conflict that happens after you made your decision in ME3? Whether you took destroy, control or synthesis. There will be a conflict that your Shep has no influence on. Even if you for example thought that your Shep would solve all future problems with his decision at the end of ME3, aren't you still interested to see, what happens in the ME universe, when in fact you are not able to do that? Is one person really THAT important, that all future problems have to be solved in your head canon? Isn't solving the Reaper problem enough?