Butler is a very special player and England I reckon are giving him some extra time to do well, a few mores games rather than less as Bayliss used to say. He was also VC until recently so has been well ingrained into the team.
The England side is changing thou, with Sibley,Burns,Crawley and Bess coming thru-the team is starting to be built a bit.
I expect Denly(big fan of his) to make way soon for Crawley to bat 3.
I think Foakes will come into the team and stay there for a long while maybe as soon as the Pakistan series. He's on his own as a keeper and a good bat with a FC record behind him.
Recent years has always been a keeper batsman but my money is on a proper keeper soon. The fact Foakes is a very good bat rather than a Bairstow(recent years) or Butler(lean period for 12 months) helps.
I also think the spinner will be a batter too-Bess or Ali- so that could cover Foakes although there's no need with Bairstow or Butlers record.
Been wrong before thou.