The BBC did two mini-series recently - the White Queen and the White Princess - that covered the War of the Roses. Supposedly there is a third mini-series in development.
I agree with you, the problem is the definitive dramatization of The Wars of the Roses has already been done and it's impossible to beat William Shakespeare or to make a version of The Wars of the Roses that isn't heavily derivative of Shakespeare.
You could say that the BBC already did bite the bullet and did this with their production of [The Hollow Crown] (https://www.youtube.com/watch?v=ngNXFbTwZZ4
) which was a fairly big budget filming (not Game of Thrones big, of course) of Shakespeare's plays starring:
Ben Winshaw as Richard II
Rory Kinnear as Henry IV
Patrick Steward as John of Gaunt
Tom Hiddleston as Henry V
Benedict Cumberbatch as Richard III
Seeing the battle of the bastards on game of thrones really made me want to see a brutal depiction of the battle of Agincourt
History in general can make for great fantasy stories.
I would be interested to see a show about it just to see how many parallels you can draw with Game of Thrones. I know that the "War of Five Kings" is largely inspired by events that took place during the War of the Roses. Some of them are more obvious than others (Lancaster/Lannister).