Based on the trade value chart, trading down from 14 to 34 is the equivalent of giving up the 36th pick in the draft straight up. That feels too rich for a 31 year old WR who's missed time each of the last two years (granted last year for PED suspension, but I'm not sure that isn't it's own brand of red flag).
I like Hopkins and think he'd be a nice addition here. But if that's the trade, I'd want something else back from them in return as well.
EDIT: For example, if they sent back their 3rd rounder (pick 66), when you washed all the draft capital out it would make Hopkins the equivalent of a pick at the end of the 2nd round (63 or 64). That feels more reasonable to me, though I'm still hesitant to give up a pick as high as 14. Depending on how you feel about Mac Jones, they've done very well picking in the top half of the first round (Seymour, Mayo, Warren, Solder, Mac), they just don't get many chances to do it.