- First player with 32/32 GOD (+x) times (current: Bunde @ 31)
Yes, Hendrik when he'll play back, maybe this summer...
- 1000 players on the page (current: 952 known, 940 players with a complete set of times)
Yes, counting 3 or 4 new players each week, I think in september.
- flap WRs total sub 8'30 (current: 8'30"875)
Yes, I think it is possible, but at least a top player must play for that, so I don't think it will happen soon, maybe in 2009...
- someone clearly dominating 50Hz (who? new player?)
- someone clearly dominating the combined ranking (who? new player?)
I think the ont who will dominate 50Hz will dominate the combined ranking...

I'd say yes, Hendrik or Richard, the first who will play back, but saying "clearly dominate" will ask a long time, maybe in 2009...
bonus:
- someone clearly dominating 50Hz
and 60hz = combined as well (who? new player?)
I'd say no. I think Marijn is too far away to clearly dominate 50Hz and Hendrik or Richard should play both Hz to dominate both rankings and I don't think one of them will play enough to that...
EDIT : I didn't read the other answers before answering myself, but it seems that everybody agrees on every questions, except the domination of both rankings, but as Marijn told he wouldn't aim at dominating 50Hz, I tempt to think I will be right to say that no one will dominate both rankings... Let's wait and see (and get this last God Hendrik !)...