I'm a PvE player, and even I know this theory is erroneous, and here's why:
They need to get the actual mix of PvP on Syndesia balanced, and thus, a major thrust of the Alpha Testing is on that very principal. You don't ever run an Alpha test purely to make the game appear fun for a group of players...that is never the goal. Too many people are treating the Alpha as just some early access to the game, and considering it by that standard because they have no idea what it means to Alpha test a game in the first place.
In the Alpha Stage, that's when you make the hard choices for the majority of the playerbase. This is when you try and discard ideas that will either make or break the game, and as such, you cannot coddle your playerbase in the process. If people are leaving the Alpha test, that only goes to show they aren't Alpha Testers. The truth of the matter is, testers are not going to be the ones who want to be coddled, they are the ones who are going to want to exactly what you just mentioned, travel 20-60 mins across the continent to a Hot Spot, Battle in said Hot Spot for an hour or so, then Attempt to bring back their loot safely through PvP infested waters as it were. They are going to want to see how creative they can get to avoid the PvPers, they are going to want to test the limitations of their builds in defending themselves, or getting themselves to the Quick Teleportation Harbors and thus to safety.
Testing is done through adversity. When the game fully launches, we already know there will be the Beast World where no PvP is possible, and thus the purely PvE who don't even want the possibility of PKing will stick to that world, just as the Pure PvP players will go to the Demon world where it will be a giant King of the Hill battle constantly with every other player group in the area.
Then we have Syndesia. For Syndesia to be the best it can possibly be. To be that ultimate middle ground where both PvE and PvP players can play together, not exactly in harmony, but with a mix of Risk and safety, they have to make the hard choices right now and test test test and re-test until they get the rules for Syndesia balanced correctly.
Alpha testing, surprisingly enough, is also NOT the period when player recruitment and retention is a focal point. You in fact don't want to worry about that much at all in the Alpha stage, because you don't want your players falling in love with a Testing phase that's just going to change when the game goes into Beta and into final release, you want them to be involved with the decision making processes along the way. That is the appeal of being an Alpha tester.
If we want this game to be the best possible game it can be, we have to let the game go through its growing pains, and not worry about fluffy clouds and rainbows, per se. They will sprinkle the tests with non PvP content, of course, so there are things the PvEers can fight to try to do unharrassed, and so they can also get these elements right, but now that the PvP testing has started in earnest, just flat opting out of PvP will only be an option if that ends up being one of the paths they consider making available in the final game, after testing all other permutations. Right now, that option is set aside for the Beast World.