Now that the new campaigns have been introduced, we suddenly have a large number of players wanting to PvP and a small number of campaigns. This means that fairly soon the campaigns are all going to get crowded and will constantly have large numbers of players on them. This is effectively taking Cyrodiil away from players who go there for PvE and players who enjoyed smaller scale PvP.
Because of the fact that there will be people swarming Cyrodiil at all times, PvE is going to be very hard to do without getting slaughtered by a group of enemy players fairly quickly, unless you're all the way back near your alliance's gates, but even then the possibility is still there. It's going to be nigh impossible to complete PvE quests in areas near your enemies' gates, even if your alliance has somehow managed to push that far, thanks to the huge number of enemy players running around.
Onto the other group, players who prefer small scale PvP. Because there are so few campaigns now, they are going to get pretty crowded. The large number of campaigns we had before the update allowed us to join in on small or large scale PvP. More people means slower performance, more crashes, more zerging and less strategy. People wanted an end to zerging being the only way of getting anywhere, and ZOS are only amplifying it.
However, I will say that there is one thing I like about the new campaigns, at that is the non-veteran campaign, as it's virtually impossible for anyone who's not V12 to get anywhere in PvP.
I think
this poll shows that players much prefer the longer campaigns; the seven day campaigns are just going to be hideous messes of zerging that involve bugger all strategy.