I'm pondering the same thing from an opposite point of view (British citizen living in the EU, having worked here for 8 years).
Don't really want to apply for citizenship here as the process is so lengthy, time consuming, fiddly, expensive etc. Plus ideologically I still feel British/European (oh the irony) more than I do the nationality here, and want to return to live in the UK at some point.
However, I don't want to get caught out later down the line either and realise I've left it too late to get nationality in time if it becomes clear it would be the best option despite the above inconveniences.
I am betting for the moment that we are going to end up in a Norway/Switzerland/Iceland agreement re: freedom of movement. Here where I live at least, people from those countries have exactly the same rights to live and work in any EU country as a 'real' EU citizen, with no extra conditions/visas/green cards/paperwork etc.
I think very probably nothing will change. I take it as a given that there is no way we wont be doing everything and anything to keep acess to the single market and London's financial passport. So will be keeping an eye on everything that is said re: whether there is a cat's chance in hell of getting that without accepting freedom of movement - doesnt look like it to me.