Answered your own question my friend, we will decided, when to put up and when to shut up!
This is nonsense, we will win some and lose some that's true, but we have the flexibility to do as we see fit and not be corralled by the 27 other countries in the EU
I understand your argument that could be boiled down to a 'good biggn' beats a good littlen' any day' The problem is that looking to the future, as I did in an earlier post, China (who is able to plan in 50 year cycles) is on course to be the major economic force in the world by the end of the 21st century, only the US can stop that, but the Trump effect will either boost that chance, or blow it out of the water, (suppose it depends if he wins a second term) just maybe South East Asia combined might act as a break on China, but not the EU, as things stand its still too fragmented, too moribund, too incompetent and the disparity between its internal economies is too great for a true powerhouse of a European Unified state to emerge in time.
The only chance the EU has is to move towards and USE post-haste, with Germany/France (depends on how successful Macron is in his reforms) being the driving force and using the power of the euro-zone as a conduit for reform. Britain stands in the way of that, we will never give up the pound sterling and join the euro-zone, we already have opt outs, we will demand more opt pouts in future, so, from the EU's perspective they would be better off without us.
We have enough wealth and investment potential to work alongside, but not part of the EU, together but separate we can make a difference on the world stage. Britain will make deals on its own that will aid the EU, providing their is a deal in place between us to kick-it all off. As Tusk said if there is no deal there are no winners only losers, for once I agree with him!