They could pick Russell, Brough, Flower and the NRL based Welsh second row without particularly weakening the squad. If Lions tours were a regular occurrence, a Welshman looking to move up to our game from another sport might suddenly be faced with the prospect of a major tour and an already excellent and growing World Cup every 4 years. We could make that a selling point...
Like anything else, this could work if enough people put in enough effort to make it work. We got over 7k to Bristol for a mid week USA-Cook Islands game, so can get 5 figure crowds for Lions matches.
The Aussies and Kiwis were away for 7 weeks for the World Cup. It would do us no harm at all to have a squad together for a long period of time, if only to pick up any Hockesque behaviour earlier than immediately prior to the World Cup.
To my mind the key people in this are the players. They're the ones who complain about the lack of international opportunities. If they're keen on what could be a life changing experience then we owe it to them to make it happen.
As for the fixture list, we have played Winfield Cup teams in the past, but the home team has generally been happy to adjust the level of player turning out so as to ensure even our mid week teams are competitive.
Lions tours have a very long history, and have brought out some heroic performances.
By 2015 we could have nearly a dozen available players already based in the NRL - getting everyone together for a long period of time could be vital in building a team ethos, learning off one another and finding out about each other, in a way that you can't replicate by get togethers during the SL season any more.
The more I think about it, the more I think that the pro's vastly outweigh any con's.