Would be devastating if he left.
If we qualify for the CL, Van Persie will have just made our financially cautious owners over £10m off his own boot.
If they're sensible investors, they should reward him appropriately—after all viewing the club as an investment means he's basically funnelling that money straight onto their bottom line.
We have to keep him. Aside from him being the best player in the PL, this season has been the first in years that we've had a real Arsenal man with a bit of fire in his belly as captain. If we're to succeed any time soon we desperately need him at the core of our squad respected and surrounded by quality players.
However, I don't think the wording in his speech is really anything to worry about. There are plenty of things to make his decision contingent at the moment—our financial offer, our qualification for Europe, further signings—and he could hardly make such a speech without referring to his future as a player, so he did so in a way that was neutral with respect to his bargaining position.
What we should worry about isn't this speech, it's CL qualification and our long track record of failing to induce our best to stay with us.