We can surely upgrade upon the junk midfield we have right now. We badly need a ball player, and I think Silva, ( if we get CL , maybe through EL) will consider Arsenal , given good wages and w/ Arteta in charge.
Right now Arteta or even Freddie doesn't have much choice given the personnel we have. None in the midfield can dribble and hold on to the ball, none can even get to scoring positions like Ramsey or have a clean shot at goal. When Xhaka scores , it is usually a collector's item, and an exception.
I think with our brand we can still attract some quality players ( S.America or EU) but we need to spend. Maybe Edu can wave his magic wand and find another Martinelli in the middle. Never say never!