Realistically if technological advances continue in the direction that they have been going over the last 50 years the records could fall very drastically. The tracks can get faster the recovery and nutrition will get much better which will lead to very fast times. Think about where track and field was 50 years ago and were it is today?
Track:
100m: 9.10
200m: 18.08
400m: 41.46
800m: 1:37.42
1500m: 3:16.40
Mile: 3:31.86
3000m: 6:47.86
2Mile: 7:29.60
5000m: 11:40.70
10,000m: 24:17.60
Hurdles:
110m: 12.40
400m: 44.36
3000m: 7:19.60
Long Distance:
Half-Marathon: 51:02
Marathon: 1:52:33
Relays:
4x100m: 34.58
4x400m: 2:46.08