It seems European countries are discovering the issue Science 2.0 has discussed about America for many years. Granting student visas and then denying them work ones after their degrees under the guise of job protectionism means educating the best people and then sending them abroad to be competitors.
The study, "Mobile Talent? The Staying Intentions of International Students in Five EU countries", published by the Research Unit of the Expert Council of German Foundations on Integration and Migration (SVR), compared European frameworks for international students and investigated the staying intentions of 6,239 non-EU international students in the UK, France, Germany, the Netherlands, and Sweden.
The UK specifically was cited for being even more restrictive than other European nations. While it tightens the rules, other European countries are liberalizing post-study work regimes. And due to knowledge about the work situation, students do not consider themselves long-term migrants. The UK had the lowest percentage wishing to stay: Only 51.4% of Masters students in the UK expected to stay after their studies, compared to 79.8% in Germany, 75.7% in Sweden, 65.4% in France and 64% in the Netherlands. Only 5.3% expected to stay for more than 5 years.
46.1% felt they were not welcome to stay and work in the UK. 27.4% said they had encountered discrimination but that was actually better than Germany, Sweden, France and the Netherlands.