Yeah I messed that up.I guess you mean "It's very unlikely he'll ever have a season this good again" or "It's very likely he"ll never have a season this good again" ?
Sorry for being pedantic but maybe he'll have a new chance next year already if he focusses fully on the Monuments/Olympics combo. Obviously all stars will have to align but he'll probably be top favorite in two/three Monuments and the Olympic RR. Worlds is probably going to be too hard I guess?
On your second point, yes, in theory he could win just as many big races next year, it's just that consistently winning big classics is insanely hard. There is a reason nobody had won 3 of the major races since 2005.