It's a shame they're not used, they look cool. They simply have no real use in the game for the points they cost.
I've mentioned before, a way to breathe some life into these ships may be through new scenarios. That is, a bombing run scenario in which a player must bomb a specific target whilst his/her opponents try to stop them. The attacking player must choose, more bombers to ensure a hit .. or fewer bombers and a stronger escort to ensure the bomber's survivability.
I think this is a marketable product for FFG; Scenario packs. Each include some relevant terrain pieces (large Ion cannon or shield generator for example), accompanying rules and relevant tokens.
Other packs might include turrets, ground based units, etc.
I think it could be a fun variant to the standard Death Match games.
Bombers will be great when FFG introduces a ground attack expansion.