You have fallen for the problem of comparing stats across time. WRs today have much better stats than they did back when Monk played.  Find stats for WRs playing around 1981 - 1995. Really 1981 - 1991 when Monk was productive.  And you can't just compare him to Jerry Rice, since nobody's stats look good compared to Rice.
		
		
	 
From 1981 - 1990, Monk ranked #1 in receptions, #1 in receiving yards, and #8 in receiving TD.  While impressive, it still is somewhat flaVVed, as not many WR played productively all of those seasons or were active all 10 seasons.But what does that get you?
If you look at the 1971-1980 bracket . . .
The Top 5 in terms of total receptions:
Harold Carmichael, Harold Jackson, Ahmad Rashad, Reggie Rucker Charlie Joiner
The Top 5 in terms of total receiving yardage:
Harold Jackson, Harold Carmichael, Charlie Joiner, Cliff Branch, Reggie Rucker
The Top 5 in terms of total receiving TD:
Harold Carmichael, Harold Jackson, Cliff Branch, Isaac Curtis, Haven Moses
From that group, only Joiner is a HOFer.
If you look at the rest of the 1981-1990 bracket . . .
The Top 5 in terms of total receptions:
Art Monk, Steve Largent, Roy Green, James Lofton, JT Smith
The Top 5 in terms of total receiving yardage:
Art Monk, James Lofton, Roy Green, Steve Largent, Jerry Rice
The Top 5 in terms of total receiving TD:
Jerry Rice, Mark Clayton, Roy Green, Steve Largent, Mike Quick
From that group, Largent and Lofton are HOFers with Rice a lock as well.
If you look at the 1991 - 2000 bracket . . .
The Top 5 in terms of total receptions:
Cris Carter, Jerry Rice, Tim Brown, Michael Irvin, Herman Moore
The Top 5 in terms of total receiving yardage:
Jerry Rice, Cris Carter, Tim Brown, Michael Irvin, Herman Moore
The Top 5 in terms of total receiving TD:
Cris Carter, Jerry Rice, Tim Brown, Andre Rison, Carl Pickens
Rice, Carter, and Brown will get in and Irvin has an excellent shot.
If you look at the 2001 - present bracket . . .
The Top 5 in terms of total receptions:
Marvin Harrison, Torry Holt, Hines Ward, Rod Smith, Derrick Mason
The Top 5 in terms of total receiving yardage:
Torry Holt, Marvin Harrison, Randy Moss, Terrell Owens, Derrick Mason
The Top 5 in terms of total receiving TD:
Marvin Harrison, Terrell Owens, Randy Moss, Torry Holt, Hines Ward
Of this group, Harrison, Owens, Moss, and Holt should get in.  Smith is borderline.  Too soon to tell on Ward.  And does anyone even bring up Mason in HOF discussions?
As you can see from the names from the 70s, being at the top of the list for your decade doesn't really get you much in terms of HOF votes.