Hi Claregirl, I am in much the same boat and have been agonising over this for the past couple of days. I am undecided. It would be nice to get a positive sign from BF on their website (e.g 'our repairs are going well and we are optimistic of return to sailing by mid June'), but so far nothing.
As far I know, at this stage out from your journey BF will refund your ticket minus the deposit (so you would lose about 1/4 of what you paid). Also, sailing with IF on the WBYeats will cost a fair amount more than current booking (at least it does for me), so your outlay in this maneuvre will be substantial (for me, with a car and 4 passengers it came to approx. 400 lost on the deposit plus an other 350 on the increment in the IF price, so 750 euro extra on a return sailing that had cost about 1500.
If BF wanted to show some good will they would be more generous with their refund for June sailings, given the current uncertainty, but they are French so I suspect you will get the gallic shrug (you won't see it over the phone). I would have serious doubts about the June 14 expected return to sailings - it is more or less two weeks from their breakdown so probably the shipyard just said "maybe we can do it in a fortnight", however I am only guessing.
If they ultimately cancel the late June sailings as seems likely, they will have to give everyone a full refund. My thinking is that I can then get my accomodation costs back on my insurance and I will then cut my losses for the summer by getting some flights to somewhere in Europe for a week to keep the family happy.
It depends on your gamblers instinct and your wallet!