It depends where you are with regard to property prices I'm sure in the cities prices are through the roof but where I am you can get a hell of a lot of house and pool for 150,000 to 200,000. Go to 250,000 you'll get your own lake and it's a beautiful area people flock here on holiday every summer - but absolutely dire in winter, very grey. Also the housing market here is stagnant at the moment and has been for a while now, nothing is shifting at all, so if you were in a position to buy, now is probably the time. There do seem to be a lot of Brits selling up houses with lots of land to move back to the UK.
You don't need to be surrounded by Brits, I choose not to mix with that many members of the expat community because experience has taught me that a lot of them are just not that nice, and just because you have a shared language doesn't mean that you have to be friends. I do have English friends and they have turned out to be really, really good friends but I also have a lot of French friends who I use to practice my French on.
80% of my work is working from home, while living in a house that needs renovating. Once you get yourself registered it's fine, pay your cotisations, pay your taxes, keep good records and you're laughing. Working from home does mean that you have little chance to use French though so you have to make an effort to get out into the community and speak to people.
There are loads of French people in France making a living out of helping Brits with the bureaucracy, translation with builders, liaising with EDF, insurance companies etc. If you're stuck there is always someone you can call on (at a price of course) but who will sort you out.
I would say rent somewhere first and get a feel for the area, we bought our house as a holiday home initially and for that it was great, but now we're living here full time I'd prefer to be a little less isolated and a little closer to town, although where we are is great for growing DCs I imagine by the time they're teenagers it will be awful for them.
I think life is too short for what ifs, if it doesn't work you can always move back to the UK, we kept a property there although we're settled in France, but at least you can look back and think well I gave it a go.
Incidentally, my dentist sees me and the DCs and he'll extract teeth if necessary we do have to drive to the big city to see an orthodontist however.