Even if they'd implement that, 60 days would still not be enough for starting rim tribes to power up enough so they could defeat current rim tribes, such as Dr. NO, KKND or ARG.
Having just started this world about a week ago, based on my location and the activity I see of the surroundings, I agree that it would take a lot longer than 60 days worth of protection to be able to even have a chance standing up against one of the established inner/outer rim tribes. Out on the rim area near me, there are numerous 60 point grey villages and very few active players. Most of the players who are "active" aren't.
So while there is lots to farm, once a new player gets to a sufficient size that he has nobling ability, his choices to noble are going to be villages of maybe 200 points if he is lucky. Which means most of his time and resources for the second village and each subsequent one are going to be put into just getting it to a level where it is capable of producing troops rather than actually producing them in any significant quanities. Those from the inner rim area expanding outwardly would have this same issue, but they already have an established troop base and can use that and their existing resource base to funnel resources to any villages they may capture.
If by chance there does happen to be a significant number of well experienced players semi-closely located on the outer rim, they could take advantage of the huge grey city buffer zone to build pretty much undisturbed. Likewise, if they were so inclined, they could also undertake on a massive training effort and use that time before the current rim tribes wade through the grey to create some highly skilled newer players too.
But, still, with only a 20:1 ratio and 60 days, there is no way that a player who just started and manages to build to (2) 3000-4000 point villages and has the troop count to back that up will be able to withstand attacks from a player who has 60,000-80,000 points total again with the appropriate troop count to match. No matter how good a player is, he can only bounce a noble so many times before running out of troops.