Short answer, no. Basically some of the 'older' dashes are leaving the fleet although new ones are coming in. Nothing has been specifically said but I suspect that some Dash's will go on to other projects in the future, am sure BE Management are looking at different things as has widely been discussed.
The E175s are to help compete on business sectors that dont require the larger 195 but have a sector length which may be a little too long for the 'average' passenger to bare on a Q400 (if this makes sense!)