The CRJ1000 is just launched and will not enter service for a while, so Bombardier has some time to make the aircraft really good for its customers. Many A.netters have commented that the CRJ 705/900/1000 are hardly "regional" jets as they regularly fly 3-4-hour-nonstops between big cities and many CRJs use jetbridges at airports already. Prospective customers might find that the CRJ1000 will have more appeal if it can lock on to a jetbridge straight away, like the E190, A320, B737 etc...
So, what do you think chances are that Bombardier will offer the CRJ1000 with a sliding entry door in addition to the existing drop-down door with stairs? The sliding-door-concept is already in use on the CRJ (the RH
service/galley door) so this is nothing new to the aircraft type.
A sliding door without stairs will offer more usable room in the entry area during flight. A permanent FA
-seat can be attached to the wall (like on E190) and the storage area behind can be expanded. Also, if slimline pax seats are installed the bulkhead can be removed and an extra row of seats can be installed on the LH
side (Lo-Co-style where the front-row pax have their feet in the "vestibule area", like on Ryanair).