The Facilitators described after the Facilitator 1 on-boarding are few examples of directions where the community can decide to add as a facilitator. RWAs indeed would be a way to scale stablecoins, however separate discussion in later time should be taken place on the topic. Aave Protocol does already have a small RWA market deployed by the Centrifuge community.
Regarding the peg - overcollateralization and collateralization management (including liquidations) bundled together with monetary policy are measures for establishing a peg. Another interesting feature is the eMode provided by Aave Protocol V3, which allows high borrowing power that acts in a similar fashion as PSM. For example, in over peg scenario users can mint more GHO and deploy across the markets, and in case of under peg scenarios retain GHO and use it as collateral with eMode to borrow other stablecoins.