You have all the time you need. Move at your pace; the world will wait.
There was a time I felt I had to act NOW. It was 2008 and my income had fallen dramatically due to the economic crisis. I responded in earnest and readied myself for whatever might lay ahead. In hindsight, it was both the right and wrong thing to do.
I made a wise decision because life did in fact get more difficult. I made an unwise decision because many of my investments were difficult to undo. I wish I'd taken more time then, to leverage what I know today.
This is the best advice I can offer. Be strategic. Be comfortable with your choices. Do what you do because it is in your soul... let it be something you embrace, instead of a place to run to. Do not act because the world forces your hand; act because you feel in your heart it is right.
What was your past remains your past. Do not think you can leave it behind and be happy. These concretewalker friends and family you mention... your terminology shows you are distancing them, but you are of them. They are of value to you, and vise versa. Perhaps instead of distancing yourself, you could embrace them and think of how that understanding fits into the life you see as reasonable today. It has a place; whether it is large or small will depend on you.
It sounds like you are ready to embrace the agricultural side of permaculture. Have you come to realize it is more? Permaculture is about growing food in harmony with the environment, about building structures that embrace their surroundings, about consistently acting in a fashion that is in the mutual best interest of both yourself and the good earth. It is a lifestyle, complete with spiritual understanding and a foundational connection with all that surrounds you. Is this what you intend to embrace? Is this what draws your soul? I ask because all beings who find happiness do so through personal growth and love. You can't adopt a lifestyle because of fear the old economy is unsteady. You have to do it because the lifestyle you have found is in tune with your nature. This ensures you will be happy no matter what happens, economic or otherwise.
There's one other thing you might consider. A permaculture life is not always an easy life. Should you build a self-sustaining forest garden, you'll work hard now to live easier later. It's one example of permaculture as a non-financial investment. It only works if the lifestyle fits you and you remain within it. Imagine spending five years building a food forest, only to decide you wanted to return to the world of concrete and steel. Don't think it so absurd; permaculture involves casting off many illusions and not all are ready. Impetus can involve relationships, loss of kinship with those who won't follow, a yearning for the faster life, an unwillingness to break from the constant stimulation of the digital world. I can't say this does or does not apply to you, but I can suggest you think about it. You might even try volunteering your time and brawn in trade for wisdom and experience. It'll be a worthwhile trade for all involved. Don't fret the fact you'll be green; we like green.
I hope this advice helps. I don't wish to direct you either way; only you should do that. I seek only to stimulate thoughts that will help you know what is right for you.