It's a good idea if you have the time and resources. Honestly, if I won the lottery, or if some organisation was arranging funding to pay for all this, it's exactly the type of thing I would want to put into place.
Understand, though, that being away for extended periods will probably mean choosing your sites with a view to collaboration with
local community.
My fear, were I managing several sites by myself, is that during my absence, literally anything could happen, including someone destroying my site by using it as an ATV stunt site and camp ground, or someone seeing something of value they could take and
sell, and doing that.
You could also see loss due to predation, even if it's hungry bears tearing down your fruit trees to get at the top branches.
But if you decide that you're going in to create a partnership with local community, giving members things of value, like jobs and perhaps even a community stake in the business, you suddenly have someone on-site year-round, who will value the
project at least as much as you, if it is designed and created with a view to supporting the community.
I like to think of semi-nomadic bison farming as an example. If I buy a bunch of rangeland with lots of grazing, drop some bison on it, and hightail it for somewhere else, the bison could survive with only an annual culling of yearling or two-year old males above the population required for healthy genetics in the herd. I could also come back to find that someone decided that this herd was tasty-looking, and would fetch a fine price.
But if I were to start up and invest in such an operation in consultation with a ranchers' organisation looking for such an opportunity, or better yet, an indigenous group that could embrace that lifestyle and use it to both build the herd and bring in income, it's money in their pockets and food in their families' mouths when it succeeds; they have lots of reasons in that scenario to care for the project like its their own.
So you know what? Do it. Set up a semi-nomadic bison ranch somewhere in their traditional range. Set up food forests all over north and south america. Hell, grab a piece of beach in Jamaica or somewhere else and set up a seafloor-based vertical mariculture operation.
But just like you choose species that are appropriate for your conditions and for how you want them to all work together, select the operations to match the sites, and the people with them. The people that look after sites, even just to live near them and make sure people don't mess with them, are critical infrastructure if there are people there at all.
In some places, usually where there is perceived or real disparity between locals and those from away, the affluence required to come in as an outsider, arrange for the land through lease or purchase, and then develop it, could easily offend, just like showing up somewhere and trying to supplant their traditional knowledge with other ways.
If advice is sought, however, right from a project's inception, not only do you avail yourself of local knowledge about natural patterns and weather conditions, you get people on your side who might otherwise look askance at your wealth and see it as a reason to steal from you, or otherwise not intervene when some misfortune befalls.
That's my take on creating and maintaining multiple
permaculture sites. If you don't plan to include people, especially if they're anywhere near it in the first place, they will likely be your downfall, or at least an obstacle instead of the boon they
should be.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein