Regarding future structure, this is what I have in mind as a long term idea. I believe this to be a good compromise between absolutely necessary future changes and expansion, and preserving the heartland and culture of English RL as thoroughly as possible.
It's a long road to this point - it requires 2 more big European teams and another USA team, it requires proven growth and income from expansion.
It requires the Championship to become a full-time professional league, as a result of increased broadcast money and sponsorship from successful expansion.
The Rugby League Championship becomes the top UK pro league, with 14 teams. What this means is, despite what I'm suggesting below, traditional UK clubs and towns are not deprived of professional rugby to make way for overseas blow-ins. The Championship would become UK(+Ireland) only, with no European or American teams admitted for reasons that will become obvious.
Above the Championship, the Super League completes its breakaway from the RFL and is restructured as a cross-continental conference league, conceptually similar to the golden era of southern hemisphere Super Rugby.
It is split into 4 conferences of 4 teams:
2 x UK, East and West (or some other arbitrary line that groups good rivalries together)
The UK conferences have P&R to the RFL Championship.
1 x Europe/France
This can begin with 4 licenced clubs, with the medium term aim to move to P&R to FRXIII Elite One when it is feasible to do so.
1 x Atlantic
4 licenced franchise clubs: Toronto, New York City, Ottawa, and 1 more USA team.
This is supported by the USARL and CRL but no view to P&R in a reasonable timeframe.
What this would mean for English Rugby League:
The 8 best performing clubs would compete on the highest stage. Only 3 of the current Super League 12 would move to the Championship, significantly increasing the number of already full time clubs.
Championship would have P&R continuing with League One, which would operate as a semi-professional part time League as it does now.
The Challenge Cup would return to running as a UK-only competition and with the Championship operating as a full-time league would be rejuvenated by an increased number of high quality games.
If this was all to be done based on the ladders as they stand right now (entirely arbitrary) the leagues would look like this:
SL Euro Conference:
Catalans
Toulouse
Paris
Lyon
SL Atlantic Conference:
NYC
Toronto
Ottawa
Boston
Super League UK:
St Helens
Warrington
Castleford
Wakefield
Hull FC
Salford
Huddersfield
RFL Championship:
Hull KR
Wigan
London
Leeds
York
Sheffield
Leigh
Bradford
Halifax
Featherstone
Dewsbury
Batley
Barrow
Swinton
RFL League One
Rochdale
Widnes
Hunslet
Whitehaven
Newcastle
Oldham
Workington
Doncaster
London S
Coventry
North Wales
West Wales
Keighley