Selling real estate to buy bitcoin is not a perfect plan but it is not a bad plan either, because if our bitcoin investment is successful, we will be able to buy back that real estate and maybe even buy more.
If you have a place to live and additional real estate then this is a feasible option. Not if you have only one place to live and you are thinking of selling that. At least I would never advice that, your risk increases and quite a few people will get washed away if the market crashes.
But if someone starts accepting bitcoin for real estate that would be a good thing too. Maybe some ICO previously has done this, I cant recall names - pretty sure they got washed away like any other ICO.
For now, I think keeping real estate and bitcoin separate should be the target.