Donostia, Given, that none of us know what brexit is indeed going to mean, youd have to look at what we do know, not what we dont dont know. So the only firm point of reference at this time is, whilst we dont know what the UKs position on migration will be, we do know the EUs position on migration, and you can also look to your host nations position also.
Currently there is masses of EU legislation on migration. Would you be eligible for a Blue Card for example? Is your job within one of the EU quotas? Also, Is your job within one of the host nations quotas? Whats the host nations criteria for work migration? etc etc etc
Another complexity is however, that as youve said about dual nationality, the EU could implement a resolution to this issue, however a host nation, may not implement it. They may in turn, revert to national criteria, not EU criteria. About 10 eu states, refuse dual nationality. Could the EU force them to get in line with other member states? I really dont know. Theres so much outside the influence of the UK. So in short, I truly dont know at this time.
I think however, what you may be asking is, as a leave voter, what did I think of your situation when I voted?
An honest answer is, we have been living and working in europe for generations before the eu existed, and we'll be working and living in europe for many generations afterwards. Thats what I thought, and still do.
How the 'mechanism' to do that will shake down, I truly dont know. Will you be able to claim your state pension and state benefits whilst over there? Probably not. I could waffle about how it was before, but thats all that would be. Waffle. We're into new territory here.
What I dont believe is, as here, that eu nations will indeed be lining up trains to deport those nasty UK people. As here, you already have protected rights. No host nation can undo those rights youve gained as a previous eu member. The right to permanent residency for example, is absolutely enforceable. Brexit is a forward looking process, not a backwards one, and I would think in the short term, the biggest impact of brexit, will be on those wishing to live/work in the eu in the future, not those already there.