I don't think anyone of us can give a definitive answer on this one!

Personally I think you should give them a chance to recover rather than just throwing them away.

Perhaps over the next few months, and with a bit of luck they might recover.

Agree with Tg if they are now in a well drained situation they may, or may not, recover but only time is going to tell

In my experience, they will probably recover, but it may take a few weeks before you are sure. An application of a dilute solution of vinegar (1 ml / l of water) seaweed extract (2 ml / l) and white sugar (4 ml / l) will help speed things up a bit.

I and lots of people on here had similar problems with Acers this year - wind and all the rain. I made the schoolboy error of too big a pot so it got really compacted in the heavy rains and they lost all the leaves. I tried to decompact the soil and will try the solution that Tugbrethil suggests!