You realize there is only 5 sets for each affiliation in the entire cycle. So at best we get 5 pilot sets for navy and 5 for rebels, and we already know 1 rebel set is capital ships and 1 navy set is grand admiral thrawn.
The first two big expansions have been scoundrel/scum and jedi/scum. So scum clearly doesn't need another one. Sith has been strong from the beginning so we definitly need navy in the next one. I tend to agree that rebel/navy would be ideal, however, I'm expecting them to beat the pilot mechanic to death by the end of the current cycle which means lots of navy and rebel. Who knows if we'll still need more help for those factions by the next expansion or if they are
moving on from pilots at that point as well.
So that leaves a grand total of 4 pilot sets each. That's not exactly beating the mechanic to death I would say. Now, granted, we're going to get some pilot sets in other affiliations but even then that's going to be few and far between in some cases, Jedi, for example, look to only get a single pilot set.