Like Brad said -- this one is not to be sold. We'll charge money and keep the lights on no matter what. We want to provide this service like a basic utility like water and power, because that's what having a voice on the Internet should be.
I'll believe that once you actually have an escrow policy that e.g. ensures both source and domain names go into the trust of <public domain, non-profit org> if you sell or fold.
Until then, that pledge is just words which can be rescinded any given time.
To be very clear: I am not insinuating you would break your pledge, but as a user, I'd be unwise to trust a non-binding statement on a web page.
Why should I trust that this will last longer, given the same people are involved? The fact that you charge $5 / month? What do I get for $5 / month versus, say, my own VPS running whatever blog software I choose for the same money (or less)?
I have run many personal servers. They all come and go. They get hacked. I lose interest. The content goes away forever, except if I'm lucky enough for it to get picked up in http://archive.org. Posthaven is like that, but you don't have to hope. It will get archived.
Self-hosting is great and I don't think we'll ever replace it. But for the vast majority of personal content out there, you want a caretaker. I hope you'll think of us when you do.
Instead, though, you have to deal with moving all your content, repeatedly, as your chosen "forever" or "lifetime" company goes under, folds up, gets sold and shuttered, changes terms of use and claims rights to your content, or any of the other bad things we've all seen over the years.
Vigilance is going to be required whichever solution you choose, but having said that, a properly set up, locked down server based on a stable server-oriented OS distro, is going to require very little maintenance, if you subscribe to the old ways. Don't fix it if it isn't broken, and keep installed software to the absolute bare minimum required. Analyze upgrades to see if they're actually necessary (the answer is usually "no"). Pick your blog software carefully, from projects with proven track records for stability and security, and apply the same practices of keeping modules and add-ons down to the bare minimum, and you'll find there really is not much you have to keep up with.
Unfortunately no business regardless of the desire can guarantee it will run forever. It's not a matter of will alone. Any agreement to never sell your shares would imply that a entity structure without shares would better fit your stated motives.
Sorry, unless you either open-source all your code so anyone can pick up the pieces once you are unwilling or unable to continue or you show me the part of the business that details your contingency plan, this is just sweet talk.
