But Bagpuss is wrong in one thing - If the reapers are dead, so are the Geth. At least that's the starchilds claim, which IMO is an inane decision by Bioware (unless it's an inane and untrue claim by the starchild). And the starchild's claim that synthetics and biologicals will invariable fight and this will lead to the destruction of the biologicals inevitably is stupid. It can believe what it wants, but my Shepard should be able to express is disagreement. That's one of the things that makes the ending so weak, that we just have to take what the star child claims for granted and can't really interact with it.
One of the neat consequences of the Geth/Quarian peace I'd like to see would be the Geth/Quarian to start becoming more powerful and conquering the world. After all, they probably have one of the largest fleets already, and now they can turn all their civilian ships into full war ships. And they have the Geth as well! There are bound to be some warmongers among them (there are some among them, after all, which started the latest crisis between Geth and Quarian!)
In that regard, I actually wanted to see more closure and more details - I wanted these choices I took to play out in some way. I wanted to see where I doomed the universes, or at least created new conflict potential with the best intentions. That would have made the game deeper and more satisfying for me than any indoctrination interpretation or a 3-button ending.
The color-coded 3 button ending has the big flaw that it diminishes the weight of all my other choices, while I hoped for all these choices to be very relevant for the future. But the destruction of Mass Relays and an effect like Synthesis overshadows everything - but as a player, that was just one single button I pressed. It isn't really the sum of all my actions that manifest in these 3 buttons.
But the problem is - it doesn't matter whether I shot Moridin or let him sacrifice himself, whether I united Geth and Quarian or doomed the Quarian, whether I send the Krogan to help the Turians or not, every Shepard will create one Crucibile and it will have one of only 3 possible effects. All my emotional investment is in the previous things, not in this mysterious Crucible that is built entirely in the background and that gives me 3 options. And while solving the Geth Quarian conflict seems like one of the biggest achievement attainable, it feels shallow against changing all lifeforms in the galaxy into half-synthetics.The starchild says that building the Crucible, which no civilization in millions of years had managed to do, has rendered his former solution obsolete, and gives Shepard the choice of where to go from there.