Different people focus on different aspects of the game as large as WoW. I believe your experiences are valid - within the set of playing activities you experience yourself. Please don't over-generalize it to everybody, though. PvE and RP servers (or players) won't be affected as much, because world PvP has never been a big part of their gaming. Guilds raiding progression content will still raid together, because it takes consistent grouping - and their realm-specific social networks will stay within realms because of it. Arena teams, as well, are realm-based. Wintergrasp is a rather popular, successful way to make outdoors PvP meaningful and concentrated in time and space, and it won't get any worse.
The only minus I see for my style of playing is the inability to form Friends list cross-realm and to chat with friends from other realms. I usually add to my Friends list from groups I pick up. I hope Blizzard implements these options soon. They already made a step toward it with cross-realm Ignore list.