When the 146s go, and the 732s are scrapped, FR will only be left with 738s. At 189 pax these are big aeroplanes to start new routes with.
The role model (Southwest) operates an all-737 fleet, but different sizes so that routes can be started 'thin' and 'broadened' over time. Has FR made a serious strategic error in going for commonality on a too-large type? It is noticeable that EZY went for the -700 then the A319 rather than -800 and 320.