Thing is, in the two years between learning Picard would overwrite the Lit Con and the Coda trilogy being published, everyone was posting here "I hope they wrap the Lit Con up and don't leave it hanging like Star Wars did the Legends continuity." And you know what, they all got their wish. Granted, they likely weren't expecting everything to be destroyed and have its existence negated, but you knew the Lit Con wouldn't be revisited again anyway, meaning you all went into Coda (something many of the fans were demanding) knowing it was the last time you'd be visiting that particular continuity anyway.Star Wars didn't erase decades of stories from existence. They just stopped publishing new stories in the Legends continuity.
Now I've voiced my disagreements with the creative decisions made in the Coda trilogy, and I don't particularly see how it's supposed to be more comforting than what Star Wars did, but to claim the Coda "alienated" fans really inappropriate given the sole reason it exists is because the fans wanted some sense of closure for the Lit Con. If Paramount or S&S or whoever really wanted to alienate the fans, they wouldn't have bothered with Coda and have just left the Lit Con with Collateral Damage or To Lose the Earth as the last publication in that continuity with no closure whatsoever.
Yes, the scheduling of Trek novels in recent years has been unfortunate, though I understand that has more to do with internal issues at S&S and not really anything that can be fixed while they hold the Trek novel license. However, the switch to trade paperbacks should be a non-issue, Star Wars has also made the switch to TPB and abandoned MMPBs and they don't seem to have their sales impacted. Hell, they've even begun reprinting Legends novels as TPBs.I wouldn't leap to that conclusion. Irregular scheduling, lack of must-read "event" stories (either within the novels themselves or tied to current events in the franchise), and the shift to a more expensive and less ubiquitous format (yes, I know MMPB's are falling off across the board) are all things the TrekLit audience wouldn't necessarily enjoy, completely aside from the regular, ongoing meta-story sputtering to a stop over a year or two before ending in a way that was, shall we say, challenging, controversial, and not really the kind of thing that got you fired up anticipating the next novel.