Hmmm, if its instanced gaming I wont go for it.... love the 100 vs 100 battles :P
If it's NON-INSTANCED I won't go for it - I hate cookie-cutter MMORPGs and 100% instances (except for towns) were one of the best features in GW that set it apart from other games. If all the games are the same, then we have no options... They could still make 100 vs 100 battles if they wanted to - in instanced arenas. :-D
However, 100 vs 100 in GW would result in a total clusterfuck. The 12 on 12 Alliance Battles were already a bit chaotic - in that regard GW is more like a shooter (when it comes to optimal player numbers) and less like a MMORPG. The battle system is centered about immensely complicated skill synergies between different characters (there are several hundred skills in GW), so it's all about using the correct builds and using them skillfully.
I heard there will be much less instancing in GW2 and it annoys. Not only that, also the fact that ALL the "new features" are actually all found in traditional MMORPGs already, so ArenaNet is taking a step back in innovation to get another slice of the WoW (et al) pie. GW offered a refuge for all these people that didn't like traditional MMORPGs and now it will be more like them - from a marketing perspective, OK, from the player's point of view it just sucks.
I would have understood a move like that if GW had turned out to be a complete failure but it didn't - it millions and millions of accounts and for a long time it was the second most popular MMORPG in the world. I think NCSoft figured that the thing most (misinformed) people brought up in connection with GW was that it is free to play - so they decided to KEEP the business model while aligning the gameplay more with other MMORPGs - instant cash making machine: "You can do the same thing you can do in other MMORPGs but you can do them for free!"
Most likely they won't have MY cash and don't get me wrong - GW is very close to my heart - I helped shape it into the form it is today because I was an alpha tester (and afterward a 2 year player).