No, because 12 months from now, United will already be on the fully-dynamic award pricing system. There will be no award chart; more importantly, there will be no limit to the number of miles that UA could charge for the redemption that you want.

I would echo what Kacee said, but a little more strongly. I would never buy (or convert) UA miles unless there were immediate availability at an award level that I was willing to pay, and I would never buy more than I needed for that award. (In other words: top-up only).

You should assume that UA is only selling you the miles because it’s more profitable for them than selling you a flight would be.