I wrote a paragraph about Kotomi's parents earlier, but ended up deleting it to not spoil anyone. I guess I can't escape it now!
I caught that part in the anime, and I thought it was an interesting explanation. However, nothing good came out of the Illusionary World for me, and in retrospect, I almost wish it wasn't present in the story at all.
The ending was setting itself to be one of my favorite then... BAM... time reset. I raged. The drama was beautifully done in the last stretch, and while it was very sad, it was still a "good end". Rebooting everything (and destroying everyone's memories indirectly) is just lame. Sure, Tomoya deserved something happier, but life isnt quite happy anyway. We didnt need this Disney ending, or at least, I did not.