I think it's dangerous for anyone to make promises like that. Former T told me it was always, always within my control when we finished our work together. Then her circumstances unexpectedly changed and she was forced to leave the agency.

Ts certainly mean well by making such a promise but no one knows what's around the corner and promises that get broken cause long term damage. I would prefer it if my current T said something like 'My intention is to see you for as long as you need me but neither of us can be certain what the future holds.' It hurts to not have that security but life itself isn't secure and I don't feel it's fair to pretend otherwise to a client. If I was a t I'd probably prefer to work with a client on their feelings about not being able to fully promise anything while making clear my intention is to commit to them. But that's just me based on past experiences.