you realize that 6 of the top 20 WR's this year in the NFL are around 5'10" 180 right?
height certainly helps but he can do just fine with a little more weight/strength added in another offseason + NFL offseason
I counted 7 actually. Let's break it down:
Wes Welker - undrafted, spread offense, slot
Percy Harvin - 1st rounder, rare elite talent (#1 OVR recruit)
Danny Amendola - undrafted, spread offense, slot
Steve Smith - 3rd rounder
DeSean Jackson - 2nd rounder, spread offense, slot
Davone Bess - undrafted, slot
Antonio Brown - 6th rounder
What we see here is mostly a group of players who were overlooked in the draft but found a niche as a slot receiver, typically in more spread-oriented offenses that regularly utilize 3 WRs. The problem is that they weren't drafted high because slot receivers have limited draft value because few teams use them often enough to warrant spending a high pick on them. Percy Harvin and Steve Smith are stronger, more physical receivers that can be true #1 WRs in any system. DeSean Jackson was the #1 WR coming out of HS and was drafted to the right system.
The anomaly is Antonio Brown who is very similar to Dorsett actually (moreso than Tate even imo) as he is a deep threat on a more traditional balanced offense. Dorsett could succeed in a role like that, but again his draft value would be around 2nd/3rd round if that's what teams saw as his ceiling. There's nothing wrong with entering the draft if you've proven yourself and still got a 3rd round grade,
but a 3rd round grade also isn't gonna make a player instantly pack his bags and drop out of school either. Just my opinion.