Here's another way to think about that sort of king's-ransom trade for Mariota:
Let's say you make the trade to move up to #1, draft Mariota, and install him as the starter from Day 1.
Now, the first two seasons from new NFL QBs - even high first-rounders, and even among those who develop into consistent NFL starters - tend to be fairly mediocre, of course. But, hey, it's our fantasy here, so let's go ahead and say that MM's first two seasons will be waaaaay over on the right side of that bell curve. We'll assume he plays 28 games in his first two years and give him something like a 62% completion rate, 7,000 yards from scrimmage, and 50 total TDs with fewer than 20 INTs across two seasons, for a passer rating of 94 (about seven points above average).
I'd imagine anyone who is advocating that trade now would be thrilled with that outcome, right?
If so, congratulations! You've traded Nick Foles plus Shady, Cox, and this year's 1st- and 2nd-round picks for ... Nick Foles.