It is good that you accept that premillennialism is the earliest position of the church.
That lends it weight, and since eschatology will NEVER be a certain thing until AFTER the fact, it means we should at a minimum include premillennialism in our list of those possibilities that we should regularly think our way through.
In my case, I think it is the best possibility.
I think that dogmatisms on eschatology OR creation can be pretty silly. None of us even knows if we have the CAPACITY to understand either time period, except perhaps in outline form and certainty...
Dr. Bob Cooley, President Emeritus of Gordon-Conwell seminary, whom I had the privilege of sitting under in an adult Sunday school class (as he literally is the best teacher I’ve ever heard), summed up eschatology this way:
All orthodox Christians believe and have believed:
1) Jesus is bodily coming back to reign
2) There will be a bodily resurrection for all people (bodies destined for eternal life with God for believers, bodies destined for eternal separation from God, hell, for non-believers)
3) Every human will be judged by God
All eschatologies have these 3 in common. How it all works out in detail, well, in that Christians do differ.
(Cooley is, btw, a pre-mellennial, pre-trib guy, just NOT dogmatic about it)