Type-like Instrument Ratings

With the increasing popularity and availability of rental and training
aircraft equipped with "glass" panels, are we heading toward limited or
type like instrument ratings?

For example, will an pilot trained from the onset in an aircraft
equipped with a Garmin G-1000 panel from private through instrument
ratings be restricted to only those airplanes with Garmin panels?
Without the training in how to interpret the steam gauges, could they
safely fly in a traditional paneled airplane in heavy IFR?
How about the pilot trained in "traditional" panel airplanes with "steam gauges"?
Will they require an endorsement before being permitted to rent or fly
"glass panel" aircraft in instrument conditions?