That many games within games is too unstable!
Err... I mean, I'm sure some RPGs would be a cross between BTLs and games (more BTL than game), and some would be just games with VR immersion (simsense but with programmed mechanics, VRRPG), and there'd probably still be Trideo games played with a manual controller or AR (ARRPG), and table-top gaming, with PnP (it'll never die!), screened devices and AR. Basically you could implement anything that would achieve the desired effect, but if you're trying to plant the seed of a thought in there heads, to be truly effective they may have to play an ARRPG within the VRRPG...