I think Jens and most of the players have been in the game long enough to know it's rare for everything to fall into place like this, and to make the most of it.
If we do get a decent league finish and a crack at Europe, that might be enough to persuade him to stay at least another 6 months, and keep some of our key players.
If not, then we find JBA v2.0 and continue the project. He keeps talking about laying the foundations for years to come, so it sounds like the Board has a plan with or without Jens.