I think there's more chance of someone paying that sort of money for Kane, as he has more to his game than Lukaku and scores at a similar rate.
I also believe City would happily take their £50m back if they could. Liverpool had their pants down there.
Honestly, I'm not questioning his goal record or saying he isn't a good player. My point is simply that a club like Everton is a great fit for him, where he's free from the sort of scrutiny he'd come under playing for a side where every defeat leads to an inquest.
The summer will be an interesting one for him. I'm sure my old mate Chico will be ready to vault me on this, but I don't see a team scouting him for as long as I assume you would before parting with mega money, and coming away thinking that he's an upgrade on Lewandowski, Benzema, Suarez, etc.