No
The British Parliament can still choose to ignore the referendum and Article 50 wont start until the British state they want to leave. After the article is invoked Britain has 2 Years in the EU unless they leave earlier.
That is why EU Lawyers are looking for Loopholes in Article 50. So the British cannot drag it out and they can be removed.
Also the EU has given the UK the stink finger. Even if they were to stay they will loss all the concessions Cameron got the UK.
http://www.consilium.europa.eu/en/pr...uk-referendum/