Ability to play anywhere is one component of rugby globalisation. Play and do business in whatever country takes your fancy. Experience the local culture etc. Supply/demand dynamics still dictate the opportunities and the risk/reward for clubs. And does not all have to be on a professional basis. As someone said - "on your own steam".
The next step is formal partnerships between Australian clubs and French/English/Japanese clubs to share resources and IP. I think it would be great for players, coaches and local club competitions alike.
Obviously with the English comp going from September to June, there is going to be a limited share of top liners available, but it is probably the next layer down that would enjoy the experience and the benefits.
Just like the Bulldogs & Rebels partnership locally. Personally, I see more upside than downside. Understand a foreigner could take a local's spot in a team but that can (and does) happen now. It is just not as high profile as a Lancaster or Lynagh.
To strengthen the local comps, I would like to see some overseas players. Maybe cap at 2 players. No guarantee they will always be Premier Grade level.