In a one hour interview on CBC Radio (Canada), author John leCarre indicated that a remake of SP is about to go into production. It will star Gary Oldman as Smiley again. Not sure who will play Vladimir.
I didn't care for the remake of TTSP with Oldman as Smiley.
Google, find and download this recent interview on Canadian radio. It was superb !
I didn't care for the 2011 version of Tinker Tailor, either, and I have a fairly long list of problems with it. However, Smiley's People has a much more linear plot, so it seems likely that the story of the new film won't be as broken as TTSS was.
If Tomas Alfredson makes a new version of SP he could hire Mario Adorf as Claus Kretszchmar. I saw him on TV from Berlin film Festival this year. And he hardly has just one more wrinkle in his face today!
Alan Ford is well past 70, but I'd still like to see him as Saul Enderby. But who could top the great late Vladek Sheybal as Otto?
But I believe adaptation should be the main concern, not casting. TTSS movie suffered mostly from trying to fit a much longer story into two hours of running time.
You are right - to a degree. But the problem is that people nowadays will not take a three hour film, like they would forty-fifty years back from Kurosawa, Leone, Coppola and their like. Not without at least one killing per five minutes or something like that - or without a lot of sex. Preferably both. And that would really out of style. So I am afraid that a Smiley's People of 2015-16 is a dream that will never come true.
Some, although very few, moviegoers would still watch 3-hour films, but producers wouldn't. They're too busy looking at their checklists, deciding which age groups they should aim at, which product to insert where... or suddenly a new research comes up, saying that girls aged 16-17 respond better to lead characters named Matthew wearing orange sweaters, so they rewrite the whole thing, etc.
That's why I was quite impressed with the TTSS movie. Compared to the source material, it was shallow. Compared to the series, it was awfully inferior. But on its own, it was still a hundred times better than its contemporaries, Hollywood-wise. I was so prepared to hate it when I started watching, but found out that it was not half as bad as I expected.
Since nowadays the trilogy is all, I would hope they take a crack at The Honourable Schoolboy, the middle of the Karla trilogy. There is actually a lot they could cut and be left with a nice lean thriller.