If apple gets the patent and then sues Pi folks,... then yes, they may be a bit worried.
Retrospectively, they will sue commodore too for both vic20 and c64. All of sir Clive's work is sue-worthy too. They are all blatant copies of apple's intellectual property as all of history recognizes apple's superiority and, more importantly, timeless designs. Apple owns all designs throughout time because apple's designs are timeless. Physics is undeniably on apple's side. The law needs to acknowledge apple's superiority too. So it has been decided.