In a love/hate relation about this.
I love changes, one of the reasons a mmorpg is a mmorpg is because it's dynamic, if it was static most wouldnt be playing it (imo).
Whether I'll level/retwink my 170 advy at lvl 200 will depend on the reballance in a whole, realy giving an opinion on it now is pointless. And as someone kinda pointed out, NW at lvl165-170 > lvl200, just bring a 220 mate along if you feel troubled (as if such doesnt alrdy happen).
Only things I kinda dislike is that it will be less fun for those vp needing or bs loving 150s who want to stick at s10, and that the side who has the most 150's will be disadvantaged even more then now.
But yeah, lets wait and see how it will be speculation stays speculation.