What to expect from Ronaldo by Spalletti? I don't think Ronaldo will make much of an impact, maybe it will only add to Spalletti a new problem. His nature at Man United should know what will happen if he brings in Ronaldo.
I think it will be more trouble than profit. If Ronaldo's price is still expensive, of course it will not be worth the gain. I think Napoli are better looking for a talented young forward. It's not buying an old player who is starting to lose his best strength.
Ronaldo can bring more confidence for Napoli players. Also, italian league a bit have a slow playing rythm, so if Ronaldo join to Napoli, he can give a chance to bring trophy since with his skill and his performance, still applicable for Serie-A. Don't forget about money, merchandise sale can help their finance. The only problem is his salary, i'm sure maybe hard for naples to pay him.
Well of course he has a very high salary, but think about the economic return by selling only the t-shirts. Anyone who is a real fan would drool for T-shirts or tickets to go to the stadium to see a champion like him.
If he goes back to Italy it would be very nice, in any team he goes (except Inter).
It seems a little worrying if Napoli recruit Ronaldo, because Ronaldo is very ambitious for a personal record and can not play as a team fully. While currently Napoli are at the top of the standings and even, Napoli so far have not specialized in a player having a lot of goals. If Ronaldo is part of the Napoli squad then I'm afraid they will rely on Ronaldo to score goals, it will certainly be very worrying that Napoli's performance will decline.
But yes it's just a speculation because considering Ronaldo's recent attitude seems to be a concern that should be a serious consideration for the team that will sign him. We really won't know what will happen next because indeed, the gameplay in Serie A can be said to be not as fast as the gameplay in the English Premier League and of course it will be suitable for older players who still want to play.
But I personally really still don't believe Napoli will play like they are now if Ronaldo actually joins, but it's interesting to see whether the transfer of players will actually happen or not.