Most definitely, when you look at the best teams, they have these types of players. 
Aside from Piroe, there hasn't been a prolific championship out and out striker this season, you have the likes of Sainz and Brownhill in there, a fair few number 10's, wingers etc, all players that can provide that edge. 
I like Sakamoto and EMC, but not sure if they can be consistent enough across the season. Definitely think we'll see a winger or 2 added like you say to give us that depth, and more goals from out wide. 
I dare say i think we may see even more from Rudoni next season, i think he'll progress on this seasons numbers, have a good feeling about him. 
Yeah, whatever they decide to do with BTA / Norman / Simms and Wright, i think we'll see one leave and another added, from what people are saying, King wants to build on what he has rather than disrupt / dismantle too much, which is understandable. 
Unless we have crazy bids for players that we can't turn down, i don't think we'll see a massive overhaul. 
Also hope and pray that we don't have as bad luck with injuries as we have had across the team this season.