remember back in the day when littlefinger, tyrion and jaime were major characters

Chill man!! Still now they are the kingmakers. Most powerful game changers. Littlefinger is still now dangerous. If i am a player of GOT, my first kill will be him.
Its true they now have less screen time, thats the fault of directors decision to wrap up the series too early. Now the series got only 13 episodes and the only focus would be more War time less character development. But i like the drama more.

Yeah...remember when we only saw the first episode of the season and they weren't showcased in that show and we decided that they were no longer major characters? Yeah...me neither.

They're still major players. It has been ONE episode. Relax.

I suspect that Littlefinger and Jamie will each be given one last hurrah, I doubt either will make it through to the end.

Although if Littlefinger not only lived but ended up as king, I for one would not be too horrified. He'd actually make a pretty decent king, even if he is a horrible person.