In the Netherlands, we have home print tickets, but it's not possible to buy an open ticket.
To clarify, when you buy a home print ticket for a domestic Dutch journey, it is valid for any train that day. It is not tied to a particular train. It is the opposite of the British situation where they are mostly only valid on a particular train.
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Indeed, were self print extended from Advance, the only solution is a realtime link to national reservations using the Q Code. A second use means no ticket with all that that means.
The industries solution to break of journey?
In many countries including the Netherlands, Germany, Switzerland, Belgium etc., they use home print and/or mobile phone tickets for normal walk on train tickets. You do need to have the matching ID so the worst fraud you could do is the same person using the same ticket twice in a day.
Cancelling a home print ticket is even possible - see the DB website for example. In fact it is easier as you don't need to visit a ticket office.
