It seems that old factions are not used at all on THF so there seems to be no need to preserve them. Why create new content when you can utilize current infrastructure!
I would like to see content that can't be solo'd by multi-boxing because it requires simultaneous activity in different parts of the zone. (Hoorah PoTime).
When creating parts for the rogue event it would be nice to have the rogue randomly despawn as to evade and go to a different part of the zone to slowly regenerate while the group needs to go find him and finish'em off.
For the ranger event it would be cool to have a bunch of rangers randomly called to a high point so a group would need to run to them and clear or wait for despawn while everyone runs for cover or dies.
..... stupid stuff like this would be fun; it seems like Rivervale has the perfect terrain for this stuff too.