A big question will be whether this split would mean that the teams would be playing in a competition that is not sanctioned by the RFU. If that were the case, then surely any player playing in a breakaway competition would not be eligible to play for the England team (They had a similar issue with a proposed new unsanctioned competition in the USA a few years back). That would scupper any saracens player in the England setup wanting to stay. Plus it would also impact sarries attempt to win promotion to the Premiership, teams from National 1 wanting to be promoted to the Championship, etc.