My fear of marksman
Feel free to correct me, however I think this should be considered with the talk of Tristana having some gameplay changes. Adc's aren't actually "bad" in this meta no matter what people say. Rather the word itself has two meaning ad caster and ad carry.
Ad casters will always have a place in the meta no matter what happens they will always have an impact. They rely on their abilities for repositioning or constant poke. Because of this they rely on their abilities to help farm rather than a traditonal marksman would, and revolve on early game power with the hopes the game doesn't last long enough for the hyper carry's.

Ad carry's Are very attack move oriented. They excel at fighting within melee range, where they can kite who ever they're fighting and are commonly called hyper carries because many of them are.
There are a few that cross both lines, The most exceptional designed.
she focused also primarily on wave clear, with repositioning, but her Q was a powerful poke her passive allowing her to attack move more, her E being a counter to other casters, and ult helping her team mates. Also Miss fortune can be tied to both.
So Why are you afraid, you only explained what they do?
The thing between them is that they have never been able to be better than another. A common match up in today's meta may be jhin and brand vs jinx and Soraka. A kill lane vs Sustain lane. If they can stay even Sustain will win? Brand still has his range and has farmed gold from spell thief procs to still be able to trade a 1 for 1 . Soraka will have reached a power spike with team fighting. Jhin will still offer plenty of cc to help win kills, however poor jinx she has to be reliant on her team mates to land her E and her abilities won't do much on her own.
"BUT WAIT! she got ultimate, nope~
just blocked it. Most carries have one maybe 2 abilities to rely on Draven can proc his ult twice so at least one will hit, but it isn't reliable Vayne loses her condemn which is her only escape without the hope of her ultimate.
Kill lanes feel popular because we can't sustain as much as we take poke. rip soraka W nerfs tell late game.
The more power a caster has early game , the harder it is for marksman to win games. That's why power spikes from
or the once
were popular because they encouraged stronger early power which crippled the marksman. It wouldn't be so bad if Marksman had different lanes. But the only ones I can think of off hand, Kennen, Teemo, Kindred. Suffered from nerfs or just the meta being the way it is. And those bot lane marksman because they can only fight well from melee hinders their roles they can obtain to mostly jungle
which is pretty much a ranged bruiser.
When Riot tries to change a caster to also be a marksman it makes them gain late game strength which can offer little diversity in how to match it. 
So it's kinda scary to imagine what they consider will be good changes for Tristana, as well as how this will effect the future of all hyper carry Marksman.
And for the Edge Of Night Please nerf, these champions kits can be ruined completely



