So I'm new to this.

Using a projected difficulty level and after the having of BTC in the spring of next year, will an S9 be obsolete? Like so many other miners on eBay, not profitable to mine, can't even give away, considering electricity cost? Even at my $0.0395 / Kwh cost my calculations (with projected difficulty) after the halving indicate negative return.

Yes / No / What am I missing here? Enlighten me please.