I was unclear, let me try this. For teams that participate in the RMR will they also be allowed to participate, if they wish to, in the Las Vegas SL? (I know that the Las Vegas SL itself will always be around)
I'm sure that would be the case. I think some teams currently go to the Orlando and LV summer leagues.
EDIT: At least the Heat, Rockets, and 76ers had teams in Orlando and LV in 2014.
https://www.nba.com/summerleague/2014/teams/?iref:nba:sl:subnav