Jeremias, I see it like this;
I don't believe all are saved now. Paul said "not all are of the faith", and there are many more scriptures about that. All haven't yet been given the faith to believe unto salvation, all haven't as yet been spiritually re-born from above. However, I think there are kind of 2 "sides to it".
First "side", God sees the end from the beginning, and He established things in the heavens even from the foundation. From the foundation, the Lamb was slain. It was God's Plan. For all. Since God is outside of time, at the "end of His view", it has been accomplished.
Secondly however, He has ordained that it be walked out within time, in our earthly element
, for a purpose [you know, those things we spend so much time trying to figure out :)]. So what He has declared in eternity, has "not yet been fully completed/received for us in our current experience of evil
". Currently there are still friends of God and enemies of God. God has reconciled Himself
to all through the cross, but He hasn't as yet given the all faith to believe so the all will as yet reconcile themelves
to God (although God does all the initiating and accomplishing - in His timing
). So IMO, the bottom line is this; what God has declared, is, in His timeless view. But we're in
time, and for us, things happen in an order ("each in his own order" or turn).
So, there is an elect, those called and chosen to be the ekklesia (called out ones) set aside during this period for a purpose and by God's intent, given the faith to believe in this lifetime [Sons, Saints]. Then the rest, all the rest
of humankind, will be brought to Him kneeling and confessing [believing, when they're given the faith to do so] that He is Lord - each in his own turn (taught by Paul).
One line; the ekklesia/elect are predestined, all the rest are destined - as God will
be All in All.
I honestly don't have a clear view of why God chose to do it this way. But IMO, it's God's Plan of the Ages - the few now, all the rest later.