As long as Bolasie (and maybe Mirallas, but in theory he doesn't need 'replacing') is replaced then I am happy with our attacking options next season. It's only a domestic campaign, no need to have three top quality strikers. Cenk is quality, Walcott can play up there, Niasse is a proven impact player. Sigurdsson will be settled in his #10 role and our wide options are sorted. We'd have Walcott, Lookman, Vlasic and 1 more to choose from on the wings, which for me is fine.
Obviously the problems lie in midfield and defence: We have nobody who can pass a ball in midfield, and need virtually a whole new defence. Dowell and Klaassen (possibly) may get a chance, but apart from Gueye our midfield is whack. Carvalho would be a good signing, but it's essential we get some creativity in there.
Two of Williams, Jagielka, Mori, Keane must go (most likely Mori and Williams), and Baines must be replaced.
That's a lot of work in one summer.