Exactly. If you win, people will come.
Does a top 10 prospect get us wins in 2018? Probably not. Certainly not like Harper. But does it in 2019-2022? I think so.
I don't think folks are suggesting trading Harper for a fairly high prospect and not doing anything more in terms of talent for 2018. I think the only way the Nats would trade Harper would be if they bring in a transitional guy to make up for much of his offense in 2018. A guy like Martinez, who is older than Bryce and who should drop off sooner if they both age normally, but who should also be a fine bat for the near term window. If there is an outfielder who hit like Murphy in 2015, then maybe he's a good signing rather than Martinez. That said, they are not going to move Harper without a short-term transitional player. I doubt they go all in on Robles for 2018.